125x35x25的简便计算?
题目写错了吧?
125x32x25
=125x8x4x25
=(125x8)x(4x25)
=1000x100
=100000
125×33×25
=125×25×(32+1)
=125×25×32+125×25
=125×8×(25×4)+(100+25)×25
=1000×100+100×25+25×25
=100000+2500+625
=102500+625
=103125
然后再用乘法结合律
把125和8相乘正好得1000
再把25和4相乘正好得100
然后就是1000×100=100000
125×(40-5)×25
=125×40×25-125×125
=125000-(100+25)^2
=125000-10000-5000-25^2
=110000-625
=109375
100x35x50就行了!
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简便算法就是用计算器
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