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练习十二,40,38,34,65,63,61,16,26,28,42+30,83+6,61+10,84+4,31+6,75+20,38+20,52+20,计算,=72,=89,=71,=58,=88,=37,=95,=72,72,68,49,51,80,74,=,=,7,9,35,43,71,54,80,26,62,7,16,39,89,22,49,42,68,93,19,57,73,47,326=26(个),348=26(元),208=12(元),3420=14(元),55,39,44,26,64,56,49,65,56,73,45,23,2410=34(条),246=18(条),18,12,6,54,45,36,