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2.3x51+16.1x7有简便吗?发图片.

本题不可以简便

34X74 =(3x7+4)x100+4x4 =2500+16 =2516 67X47 =(6x4+7)x100+7x7 =3100+49 =3149 51X51 =(5x5+1)x100+1x1 =2600+1 =2601

34X74 =(3x7+4)x100+4x4 =2500+16 =2516 67X47 =(6x4+7)x100+7x7 =3100+49 =3149 51X51 =(5x5+1)x100+1x1 =2600+1 =2601

简便方法计算如下: 5.1x7.3+0.27x51 =5.1x7.3+0.27x10x5.1 =5.1x7.3+2.7x5.1 =5.1x(7.3+2.7) =5.1x10 =51

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