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1、练20二、小数除法186 3 6.40.8 8 0.47100.1 0.47300.6 50 4.20.3 1432.81000.1 3.282.510 0.250.93 0.30.32100.01 3.210.610 1.06612 0.57.2650 604.623 0.20.561.4 0.44.2140.9 0.271.26 0.21.68 0.23.9390.1 10.055 0.016.39 0.708.240.52 01.64 0.45.73 1.92.790100 30.123 0.040.044 0.011526.06 45.451.68 0.26.23.1 20.9102
2、4.55.41.8 30.924 0.231.5320.2 10.10.4515 0.036.321 0.30.090.060.85 165 1.20.3216 0.020.42750 30.764 0.192.84 0.71.894.01 0.8020.255 0.057.55 1.523.41000.01 23.4解决问题：猎豹奔跑的速度是每小时100千米，平均每分钟奔跑多少千米？(得数保留三位小数)10060 1.667 (千米)答：猎豹平均每分钟奔跑1.667千米。数奥同步学答案王老师乘出租车去书市。出租车在3千米以内收7元，以后每千米按1.4元收费。到达书市一共付费28元。如果行驶的
3、路程正好是整数，那么出租车行驶了 18 千米。( 287 ) 1.4 3 18 (千米)练21二、小数除法0.462 0.23 8.19 0.9 3.4205 13.64.210 0.42 0.84 0.20.3153 1.532.5100 0.3253.69 0.41.263 2.42.430 0.080.93 0.32100100 29.630 0.320.369 0.042.8504 354.210 0.424.284 1.076.397 4.90.648 0.087.515 0.50.32250 81.35 0.267.28 0.93.527 14192 9.50.8442 0.022
4、2040110 809640 2.43.618 0.22.540.23 2.33.69 0.40.524 0.130.640.8 35.46 0.915 0.21.4700.01 20.186 0.037.210 0.72200206 605.490 0.061.82 0.954189 279.62 4.84.97 0.7180.110 0.18解决问题：某公司在地方电视台播出一条30秒的广告，每天播出一次，连播两周，共付人民币35.7万元，平均每秒多少钱？35.7万357000357000(30127) 850 (元/秒)答：平均每秒850元。数奥同步学答案小明生病要吃药，服药剂量要求是：每
5、日按体重3050毫克/千克，分三次服用。药盒侧面写着 0.125克12片2板。小明体重50千克，他每次最少要吃 4 片药，一盒药可以吃 2 天。5030 1500(毫克) 1.5(克)(1.50.125) 3 4 (片)( 0.125122 ) 1.5 2 (天)练22二、小数除法3.301.1 0 2.857 25.26.82 8.60.90.40.6 0.6 0.60.060.01 3.60.070.50.01 3.51000.930.1 9.3 6310.110 63.630.567100 86.4233 6.42 880.8100 1.10.720.94 0.27.20.62 24 3
6、.14.86 2.484.21.40.3 101.6410 4 40.612 0.20.72810 0.99.688 9.6 721008 0.099.688 9.60.420.121 0.2 0.84210 4.240.259.9 9.96.8210 34 0.2426 0.0296.330.1 3216.80.26 40 5.20.040.01 1.30.5205 20.92410 2.3 7.862 2.69.330.5 1.5512.840.8 4 84010 29.620.6 861.25 25 0.56144 0.16510000.001 56320.27 181.8 930.31
7、3 100(3.26.4)0.8 121.80.01100 18000 6.46.40.5 0.50.8160.5 6.40.520.41.3 1 0.30.152 15100.3 0.20.540.093 3 9.60.86 64.590.5 18.7252 0.872 3.282.5 13520.2 3.54.260.06 0.042 6.664 26.640.80.45 1.650.250.1 200 190.80.8 194.2420.1 1数奥同步学答案甲、乙两车从东西两地同时相向而行，甲车每小时行60千米，乙车每小时行50千米，两车在离中点18千米处相遇，东西两地相距 396 千米
8、。(182) (6050) 3.6 (小时)3.6 ( 6050 ) 396 (千米)练23二、小数除法2.870.4 1 0.81270.01 3046100 00.6480.5 0.16 3.23.2102 1025.242 2.63.690.25 0.1 0.30.152 10.480.80.6 13.20.40.8 6.4 4.250.0110 42503.61000.01 3.60.80.20.6 4.6 6.392.5 3.28.4510010 84.54.31100050 86.2 7.3228 11.661.80.015 0.00364.24.25 0.2 0.8170.5 6
9、.85.130.1 174.9700.01 7 3.70.0120 18.54.8300.4 0.40.71.20.4 2.1 5.21.30.32 3.681.60.40.4 1.60.080.0450 100 2.847 4.90.80.42 10.50.255 10 0.1546 0.10.840.73 0.4350.07100 50000 5.63.53.5 5.64.2100.03 140050.012 1000 510025 206.92.33 94.82.45 10 00.1254.28 03.403 00.8467 0.02 0.720.18 0.90.721000.9 804
10、.275 3 52.21.1 1040.122 0.249210000.001 92 3.450.15 6.9100.010.01 10362 1 7.553 0.50.3280.04 02.80.716 20 0.80.84 0.64.254.258 819.625 1.96 0.950.6 0.310.18787 10.1数奥同步学答案五年级师生380人乘车郊游，大客车每辆坐60人，往返车费120元；小面包车每辆坐20人，往返车费80元。请设计最便宜的租车方案，共需 800 元。12060 28020 42 4380606 (辆)20 (人) 20201 (辆)6120180 800 (元
11、)练24二、小数除法6.48 0.8 0.70.6 0.42 19.625 1.961.47 9.8 0.40.4 0.161.60.40.2 204100 0.042.70.09 3013.70.258 27.40.20.2 10.60.5 1.20.950.6 0.39.66 1.61.0540 4232.85.67.2 45.60.254 12500.4 1000.250.984 0.9840.04 1000.060.01 67.553 0.50.120.3 0.40.153 0.45100.328.68 1150.4 67.20.6 120.3280.04 02.037 14.210.
12、41000 40010.18787 10.11.320.01 1321.32100 132(82.5)0.4 4.22.87 0.42.41.2 20.250.034 0.03360.04 9005.80.1 0.580.50.60.2 0.069.64 2.40.40.45 0.182.80.716 200.17200 340.20.5 0.10.1355000.2 13.511.30.3 3.393.650 1800.840.84 00.60.03 20321100 3.214.254.258 84.70.1 0.477.22.8 1080.85 500.960.3 3.287.2 0.
13、827.32.54 2734.80.8 61.60.4 429.72.50.4 29.7数奥同步学答案图略，蚂蚁爬了2008厘米后将停在图中的A点(出发点)。因为蚂蚁每爬一圈走过的距离是：142 8 (厘米)2008 8 251 (组)练28三、观察物体720180 9000.364 0.097.852 782982 596 4.20.8 3.43205025 6400.83 2.44.62 2.30.1255.98 5.90.4300 1200.462 0.2321457 1350.60.6 0.368.84 2.22.81.60.4 4.80.5101 50.572125 90005739
14、 740.846 0.143.812 7.620.125158 151235 6150.4200 802.544 1105.40.9 69.60.5 4.80.60.530 90.80.2 42.450.01 24517282883 280004.25 0503.2 1605432.416.6 5695474 2215299 51481540.7 420.320.32 14.83 14.4990.610.61 610.252 0.57.25 361.20.250 3003.254 130.35100 351.253225 100006.48 00.6330 0.0212.4(55) 24639
15、0 56704.50.1 0.4513254 13003.24 0.8324100 3.241300700500 110030848 26070.6 4.242067 102425 6001.244 4.964345 860数奥同步学答案右图（略）中有 60 个长方形（应为“矩形”，否则总数中应减去正方形个数）。(4321) (321) 60 (个) 练29三、观察物体0.420.07 60.5101 50.50.483.523 15299 5148 9.60.5 4.890.46 0.60.6330 0.0217.37.3 1633030 63303.5 105324100 3.24300.
16、160 55.40.9 670.6 4.24.23.60.4 10.35100 3569.147.4 21.7120255 6007.86 46.84.83 14.46.554 5.21.59.9 14.850.364 0.091.8153 94.50.1 0.451235 615(0.170.09)0.2 0.43.89.9 37.622425 6006.283.7210 200.846 0.1472125 90002.5321.25 1000.35100 350.60.6 0.3660.143 0.284.20.8 3.41.244 4.9663.120 0.9370.6 4.23.254
17、 1345305 2700.83 2.48.84 2.24.2206 144.62 2.30.252 0.5500.040.1 0.24.50.1 0.45503.2 1603.66.47 1704.25 03.812 7.6212.50.810 1000.462 0.230.4200 800.422004 213.24 12.86390 5670107.8419 36.84数奥同步学答案图（略），正方体的六个面上A、B、C、D、E、F排列顺序完全相同，那么A的对面是 D ，B的对面是 F ，C的对面是 E 。 从图上可知A与B、C、E、F相邻，故A的对面只能是D；再根据相对方位可以推出E、F
18、的位置。练30三、观察物体2.450.01 2454250 10004.26102.13 20207.6 12.4 269.9 257.42.40.241 119.89.9 19.740.02 0.084.57.87.8 4.54.3101 434.325 0.44.590.5 0.2536600 0.064.80.08 605(0.40.8) 64.85 244.80.08 3003.26102 16.3425199 22615.73.7 12403220 644.83.9 8.714 0.25485200 40920105 8154.5101 454.50.5493 1.621.98 15
19、.23.450.55 46.33.53.5 6.33.212.29 5.53060 0.52.0592.05 20.55.773.66 2.117.82.2 107.8997.8 780303.5 1054.97.1 1236120.5 216523275 2482.730 814.51014.5 4500.320.08 4130.5 6.53.40.60.4 2.47.86 1.39.88.7 18.50.65.46 1.56044 1517.83 2.650.62416 10.641.2 4.850.522.7 27.83.422.486.58 7.520.846 0.1418.316.4
20、 1.9418524 2104.73.9 0.80.60.12 0.0721.365.40.64 7.4数奥同步学答案图（略），正方体的六个面上分别写有A、B、C、D、E五个字母，其中有两个面字母相同，根据下面的三个视图，可以断定 C 被写了两遍。 从图上可知A与B、C、E、F相邻，故A的对面只能是D；再根据相对方位可以推出E、F的位置。练31三、观察物体0.1258 12.80.04 700.630.90.5 0.24.91.9 3 6.447.42 13.8619.97.92.5 14.540.02 0.081.480.26 1.745110151 51003.4100 3400.40.5
21、 0.2454.6 5.45.40.06 901.62.5 4329108129 927.20.08 909.90.3 334.7994.7 4706.241.04 65.774.68 10.45660090 405.40.9 6424.2 37.80.3654 0.453044 7636.524.1 12.49.332 6.247.62 23.8451.1 49.52742716 54014.53.7 10.89.048.42 0.627.24.52 0.812.60.6 1278030 260.5401.3 26844 2157030 190.90.45 1.8506109 39790.0
22、3 3000.040.080.4 0.1950280 670106.4 3.61.257.68 76740180 5605680 0.75.61015.6 560700238 462400.01 400065.839.910.1 15.824.50.1 2.457010 718.325 1.833.41.8 1.66.31.8 8.1700620305 38592.782.3 10.44199 40594.525 1.8数奥同步学答案图（略），在正方体的八个顶点中选出四个，使它们中的任何三个构成的三角形都是等边三角形。等边三角形的三边等长，从图上可知这个边长应该是任一面上的对角线。因此四点组合
23、有：ACFH以及DBEC。练32四、简易方程1、 设长方形的长是a，宽是b，周长为C，面积为S，那么：周长公式：C(ab)2面积公式：Sab2、 设正方形的边长是a，周长为C，面积为S，那么：周长公式：C4a面积公式：Sa23、 设路程为s，速度为v，时间为t，那路程、时间、速度之间的关系用字母可表示为 svt 。4.515.5 202524 634.80.40.6 3.83.73 11.1 4.80.6 80.48810 0.64.85 242190 18905435.24.8 144.84 1.29.85 490.80.54 4.40.81.4 2.2580.6 34.84.860.8 1
24、7.64 30.42415.2 8.82.460.2 2240190 4301.30.9 2.21.4200.5 146930 20704.20.6 4.80.254.324 4.32107.2 2.8881.1 96.82.51.734 17.315.92.7 13.28.96.8 2.10.30.154 0.517.432.6 5023.218.4 4.812.556.260 8.71864 46.55.699 554.49.261.258 92.632.55 6.53.62.50.4 3.6189.9 178.2249.9 237.62.80.4 72.5244 240数奥同步学答案在下
25、题的方格中填上一个合适的数，使等式成立。(9)9999(999)991练33四、简易方程省略乘号写出下面各式ax axb8 8b12 1xx x2 b1 1b22 43a 3ac9 9c32 9x4 4x5q 5q42 16ab ab7k 7k52 25a8 8a12c 12c62 36bb b23a 3a72 49a1 1a1c 1c82 644a 4a1b 1b92 81t8 8t5d 5d102 100ac ac6k 6k112 121st st7k 7k122 1448a 8ax6 6x132 169x8 8xz9 9z142 196a5 5ay10 10y152 225b10 10b
26、8x 8x162 2568c 8ca2 2a172 28912b 12b6r 6r182 3245c 5c8y 8y192 361202 400数奥同步学答案规定 a*ba(a1)(a2)(ab1) (a、b均为自然数ba)。如果a*1072，a 2.7 。7210a(123456789)10a4510a724527a2.7练34四、简易方程3x6x 9x12x1.2x 13.2x3x4x3x 10xb4b 5b 4.2tt 3.2t4.8xx1.2x 7xxx 2x1.5a0.9a 0.6a7x4x5x 6x18x9x 9x7.8x2.2x 10xb0.3b 0.7bx2 2x9a6a 3a
27、6x3x2x 5x7b7b 03.6a4.4a 8a9x5x 4x3x4.5x 7.5x17x14x 31x7.2x2.2x 5x7b4b 3b9.05t2.15t 6.9t3.7x6.5x 10.2x5.2a3.2a 2a3.5bb 4.5ba4a 5ax5x 6x1.7x1.4x 0.3x3.6x1.2x 2.4x4.5a2.1a 2.4a8.6x5x 3.6x7.2x4.2x 3x18x14x 4x4.8b3.2b 8b7.8t5.3t 2.5t15b7.5b 7.5b5b3b 8b3.2x4.8x 8x8x5x 13x5.6a3.6a 2a9a0.03a 9.03aaa 2a0.27t
28、2.33t 2.6t3.6b4.4b 8b4a6a 10a2a4a 6a3.4x2.6x 6xb0.5b 0.5b5x4x 9x4.8aa 5.8a2a2.5 5a7x3.4x 10.4x1.2xx 0.2x7.5y5y 2.5y15x7x 8x8x4x 4x9.2x0.8x 10x8x4x 4x15x7.5x 7.5x数奥同步学答案如果一个数与它自己相加、相减、相除其和、差、商相加的和为8.6，那么它是 3.8 。( 8.610 ) 2 3.8练35四、简易方程把方程圈出来x3 68x 55x 05x 5 9x 88x8 173.2xx 1.62y3y 15285 2x4.83.9 8.75
29、500500 115061093 4000320 0 5.42.3 3.1340020002 240072018 403.63.6 11351.3 2310.1 3101.154 59.4700238262 2007.69.9 75.24409324 733640165 2000420 043010 43420270 12442.5 1105.773.66 2.1140.513.520.5 47.54.215.59 9.8960105 10651648 8281.1 30.84300.01 430003241111 32442020 214.83.2 88.76.94.4 2024080 16
30、03.60.1 36750530 53600180 201200300 431.921.110 43630090 7045900 0.05520138 52811 3082.480.08 2.414007005 10数奥同步学答案某数减去8再乘以4最后加上7，得11，那么这个数先加上7再乘以4最后减去8，得 56 。( 11 7 ) 4 8 9 ( 9 7 ) 4 8 56练36四、简易方程4806 8070020 350.320.5 0.165.670 0.083000.03 95.5580 88879.9 861.3 4500500 94004000800 3600400173 22755
31、01.1 5004.484.480.1 0.1450.1 4501.930 574.8480.01 109.24.8 4.45400600 94005080 0.164040 163.6101 363.624.317.712 3036040 93.644.8 9.63.20.0140 842021 200.543 1.6240.250.5 21.136 39.62450 12005.943.481.52 0.9457030 19421.1 46.23.210080 43203.2 10349198 15180200400 402412.5 11.513.411.6 1.870.90.7 904.8 00400 03.25025 01.3822.2 23.583.116 18.66400560298 662箱子里装有同样数目的乒乓球和羽毛球，每次取出5个乒乓球和
