题目内容
用你喜欢的方法算
76×105+24×105 | 125×64 | 0.27×99+0.27 |
38.5-1.46-5.54 | 329+186+271 | 1.25×9.6×0.8. |
考点:运算定律与简便运算,小数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:①76×105+24×105,运用乘法分配律简算;
②125×64,转化为:125×8×8,运用乘法结合律简算;
③0.27×99+0.27,运用乘法分配律简算;
④38.5-1.46-5.54,根据减法的运算性质进行简算;
⑤329+186+271,运用加法交换律和结合律简算;
⑥1.25×9.6×0.8,运用乘法交换律和结合律简算.
②125×64,转化为:125×8×8,运用乘法结合律简算;
③0.27×99+0.27,运用乘法分配律简算;
④38.5-1.46-5.54,根据减法的运算性质进行简算;
⑤329+186+271,运用加法交换律和结合律简算;
⑥1.25×9.6×0.8,运用乘法交换律和结合律简算.
解答:
解:①76×105+24×105
=(76+24)×105
=100×105
=10500;
②125×64
=125×8×8
=1000×8
=8000;
③0.27×99+0.27
=0.27×(99+1)
=0.27×100
=27;
④38.5-1.46-5.54
=38.5-(1.46+5.54)
=38.5-7
=31.5;
⑤329+186+271
=186+(329+271)
=186+600
=786;
⑥1.25×9.6×0.8
=9.6×(1.25×0.8)
=9.6×1
=9.6.
=(76+24)×105
=100×105
=10500;
②125×64
=125×8×8
=1000×8
=8000;
③0.27×99+0.27
=0.27×(99+1)
=0.27×100
=27;
④38.5-1.46-5.54
=38.5-(1.46+5.54)
=38.5-7
=31.5;
⑤329+186+271
=186+(329+271)
=186+600
=786;
⑥1.25×9.6×0.8
=9.6×(1.25×0.8)
=9.6×1
=9.6.
点评:此题考查的目的是理解掌握加法、乘法的运算定律和减法的运算性质,并且能够灵活运用这些运算定律和运算性质进行简便计算.
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