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12.5×0.4×2.5×8

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

解:原式=(2.5×4)×(12.5×0.8) =10×10 =100

0.8×0.25×0.4×12.5 =(0.8×12.5)×(0.25×0.4) =10×0.1 =1 这是简便运算的。

76

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

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

12.5*0.4*2.5*8 =(12.5×8)(0.4×2.5) =10×1 =10

12.5×(0.8+4)×2.5 =12.5×0.8×2.5+12.5×4×2.5 =10x2.5+12.5x10 =25+125 =150

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