题目内容
怎样简便就怎样计算.
3.7×2.5+4.3×2.5 | 0.75×18÷0.15 | 44.1÷4.9÷0.9. |
解:(1)3.7×2.5+4.3×2.5,
=(3.7+4.3)×2.5,
=8×2.5,
=20;
(2)0.75×18÷0.15,
=0.75÷0.15×18,
=5×18,
=90;
(3)44.1÷4.9÷0.9,
=44.1÷(4.9×0.9),
=44.4÷4.41,
=10.
分析:(1)运用乘法分配律简算;
(2)根据乘法交换律简算;
(3)根据除法的性质简算.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=(3.7+4.3)×2.5,
=8×2.5,
=20;
(2)0.75×18÷0.15,
=0.75÷0.15×18,
=5×18,
=90;
(3)44.1÷4.9÷0.9,
=44.1÷(4.9×0.9),
=44.4÷4.41,
=10.
分析:(1)运用乘法分配律简算;
(2)根据乘法交换律简算;
(3)根据除法的性质简算.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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