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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

100

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

12.5x2.5x0.8x4 =(12.5x0.8)x(2.5x4) =10x10 =100

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