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125x(8+4)x25如何巧算?谢谢!

(125x8)x25+125×(4x25) =1000x25+125x100 =25000+12500 =37500

可以

(8+4)x25 =3×4×25 =3×100 =300

答案是: 8x25十4x25=300 先把两个加数和这个因数分别相乘,再相加,就等于答案。

125x(4-8)x25 = 125x(-4)x25 = 125x(-4x25) = 125x(-100) = -12500

125x(4+8)x25 =125x12x25 =(125×3)x(4x25) =375×100 =37500

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

125x64x25 =25*5*8*8*25 =5*5*5*2*2*2*2*4*25 =10*10*10*2*100 =200000

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