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125x(4 8)x25的简便方法怎么做

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

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

括号内先算,4-8为-4,4和25相乘为100,100乘125,为12500,加个负号,就是-12500

[(4x8)x25-8]x125 =4×8×25×125-8×125 =4×25×8×125-8×125 =100×1000-1000 =100000-1000 =99000

125x4.8x25 =125x8x0.6x25 =1000x15 =15000

40x125x8x25 =(40×25)×(125×8) =1000×1000 =1000000

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

125x25x(40+8) =125x25x40+125x25x8 =125x(25x4x10)+(125x8)x25 =125x1000+25x1000 =(125+25)x1000 =150x1000 =150000

125×25×4×8 =(125×8)×(25×4) =1000×100 =100000 运用了乘法的交换律与结合律

125X3x8x4x25的简便运算 125X3x8x4x25 =(125*8)*(4*25)*3 =1000*100*3 =300000

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