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1.2x2.5+0.8x2.5简便

1.2x2.5+0.8x2.5 =(1.2+0.8)x2.5 =2x2.5 =5

1.2x2.5+0.8x2.5的简便计算过程是: 1.2x2.5+0.8x2.5 =(1.2+0.8)×2.5 =2×2.5 =5 解题思路:两个相乘的式子相加,经观察发现两个式子中均有一样的因数2.5,而且其中两个因数1.2与0.8相加的结果是整数,所以考虑使用乘法的分配律进行运算,将2.5...

=2.5*(1.2+0.8) =2.5*2 =5

1.2x2.5+0.8x2.5能简便的要简便 =2.5×(1.2+0.8) =2.5×2 =5

=2.5×(1.2+0.8) =2.5×2 =5

1.2x2.5+0.8x2.8 =3+2.24 =5.24

=(1.2+0.8)乘2.5=2乘2.5=5

解:采用拆分法和结合律, 原式=1.2X2.5X0.8x2.5 =0.3x4x2.5x0.2x4X2.5 =0.3x10x0.2x10 =3x2 =6

1.2×2.5+0.8×2.5 =(1.2+0.8)×2.5 =2×2.5 =5

=(1.2+0.8)*2.5 =2*2.5 =5

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