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125x25x40x8的简便算法

(125x25)x8=125x25x8=125x8x25=1000x25=25000

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

125x25x4x8=(125x2)x4x(25x4)=250x4x100=1000x100=100000

125X4X25X8=(125*8)*(4*25)=1000*100=100000

125*8=10003*40=120120*1000=120000

简便计算:(125十40)x8,脱式: (125十40)x8 =125x8+40x8 =1000+320 =1320

125*25*8*4=(125*8)*(25*4)=1000*100=100000

125x(8x40)=125*40*8=1000*8=8000 运用乘法交换律和结合律

125x25x32用简便方法算125x25x32=125*25*8*4=(125*8)*(25*4)=1000*100=100000

=125x8x40=1000x40=40000

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