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12.5×0.4×2.5×8

12.5×(0.4+0.8)×2.5 =12.5×(0.4×2.5+0.8×2.5) =12.5×(1+2) =12.5×3 =37.5 望采纳 谢谢

12.5×0.4×2.5×8 12.5×0.4×2.5×8 = (12.5×8)×(0.4×2.5) =100×1 =100

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100;②9.5×101=9.5×(100+1)=9.5×100+9.5×1=950+9.5=959.5;③1.2×2.5+0.8×2.5=(1.2+0.8)×2.5=2×2.5=5;④26.8×99+26.8=26.8×(99+1)=26.8×100=2680.

解:原式=(2.5×4)×(12.5×0.8) =10×10 =100

12.5×0.32×2.5简便计算 12.5×0.32×2.5 =12.5*0.8*0.4*2.5 =10*1 =10

(1)12.5×0.4×2.5×8=12.5×8×0.4×2.5=(12.5×8)×(0.4×2.5)=100×1=100(2)9.5×101=9.5×(100+1)=9.5×100+9.5×1=950+9.5=959.5(3)4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42 (4)0.8×72.4×12.5=0.8×12.5×72.4=10×72.4=724

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

12.5×8和0.4×2.5再相乘

0.8×4×12.5×2.5 =(0 .8*12.5)*(4*2.5) =10*10 =100 使用乘法交换律 谢谢采纳

0.8×0.25×0.4×12.5的简便运算写法如下: 8x0.25x0.4x12.5 =(8x12.5) x (0.4x0.25) =100x0.1 =10 分析:此题主要根据乘法交换律及结合律计算。当看到这类题型,先把小数当成整数来看,遇到25首先想到4,遇到125首先想到8。还要注意运算顺序和运算...

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