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1、 2- , ,789 , ,366=,204=,186=,205=,43=,84=,246=,255=,306=,123=,6.1 ,56 8 . , ,7 8 =56 7 .,568=,：( ) 56=8,7,7,56 8 . , ,7 8 =56 7 .,568=,：( ) 56=8,7,7,7 , , .49 7 ., , .,497=,7,：( ) 49=7,7, .49 7 ., , .,27 9 ,279=,3,：( ) 27=9,3,328=？ ( ),A,74= 8 2= 9 6=28 4= 16 2= 54 6=28 7= 16 8= 54 9=, ,28,7,6,4,9,5
2、4,8,2,16,=2,=2,=2,=4,=4,=5,=3,=6,=4,=3,=6,=5,=3,=5,=7,=8,=2,=6, ,根据口诀改写出两道乘法算式和两道除法算式。,48=68,_=_,_=_,_=_,_=_,63=79,_=_,_=_,_=_,_=_,6,8,48,8,6,48,48,8,6,48,6,8,7,9,63,9,7,63,63,9,7,63,7,9,162,7,729,637,546,142,819,324,639,213,355,486,567,426,273,455, , , ( ) ( ) ,4,9,4,5,8,3,6,7,9,P51 3. ,279,324,488,305,426,355,246,639,364,405,182,217, ,648,213,328,455,728,186,549,369,284,99,142,497,7,8,4,9,7,1,7,7,4,3,6,9,54 9 , ,
