简便计算并写出过程.
①125×32×25
②132×77+22×132+132③1139-(350+139)④1170÷9÷13.
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解:①125×32×25,
=125×8×4×25,
=(125×8)×(4×25),
=1000×100,
=100000;
②132×77+22×132+132,
=132×(77+22+1),
=132×100,
=13200;
③1139-(350+139),
=1139-350-139,
=1139-139-350,
=1000-350,
=650;
④1170÷9÷13,
=1170÷(9×13),
=1170÷117,
=10.
解析分析:①先把32分解成8×4,再运用乘法结合律简算;
②运用乘法分配律简算;
③运用减法的性质简算;
④运用除法的性质简算.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.