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1.25乘0.32乘2.5加2.5(简便计算)

=1.25×0.8×0.4×2.5+2.5 =1×1+2.5 =3.5

2.5×0.32×1.25 = 2.5×1.25×0.4×0.8 =(2.5×0.4)×(1.25×0.8) =1×1 =1 在这里运用的是乘法结合律。乘法结合律也是做简便运算的一种方法,用字母表示为(a×b)×c=a×(b×c),它的定义(方法)是:三个数相乘,先把前两个数相乘,再和第三个数相乘;或先...

3.2x1.25x2.5 =4x0.8x1.25x2.5 =(4x2.5)x(0.8x1.25) =10x1 =10

1.25x0.32x2.5 +2.5简便计算 1.25x0.32x2.5 +2.5 =2.5*(1.25*0.32+1) =2.5*1.4 =3.5

(1.25×8)(4×2.5)=10×10=100 括号里的两个式子应该是必须的记住的两个,125×8=1000 4×25=100 很多地方都用得到这两个。

如图

0.87×100.01 =0.87×100+0.87×0.01 =87+0.0087 =87.0087 1.25×0.025×2×0.5×0.32 =﹙1.25×0.8﹚×﹙0.025×0.4﹚×﹙2×0.5﹚ =1×0.01×1 =0.01

7.25乘以1.25+1.4乘以2.5的简便计算 解:采用凑整法, 原式=7.25x1.25+1.4x2.5 =7.25x1.25x8÷8+1.4x2.5x4÷4 =7.25x10÷8+1.4x10÷4 =72.5÷8+14÷4 =9.0625+3.5 =12.5625

1.25×32×2.5=10。 简便计算过程如下: 1.25×32×2.5 =1.25×8×4×2.5 =(1.25×8)×(4×2.5) =10×10 =100 扩展资料: 乘法: 1)乘法交换律:a*b=b*a 2)乘法结合律:a*b*c=(a*b)*c=a*(b*c) 3)乘法分配律:(a+b)*c=a*c+b*c;(a-b)*c=a*c-b*c ...

1.25x2.5x0.32=1.25x2.5x(8x0.4) =1.25x8x(2.5x0.4) =1x1 =1

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