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简算:0.5x0.8x0.4x1.25x25

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0.4x125x25x0.8 =(0.4×25)×(125×0.8) =10×100 =1000

0.4x125x25x0.8简便计算 0.4x125x25x0.8 =(0.4*25)*(125*0.8) =10*100 =1000

1.25x(8+0.4)x25 = 1.25x8x25+1.25x0.4x25 =10x25+1.25x0.4x25 =250+1.25x10 =250+12.5 =262.5

(12.5x0.54x1.4)(0.21x25x0.8) =(12.5x2x0.7x0.54)(0.21x25x4x0.2)=(25x0.7x0.54)(0.21x20)=17.5x0.54x4.2=35x2.1x0.54=73.5x0.54=39.69。

7.8x25x0.4 =7.8x(25x0.4) =7.8x10 =78 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

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