题目内容
5.算一算.62-8×6 | 45+54÷6 | (72-36)÷4 |
871-381+129 | 1000-533-357 | 440-400÷5. |
分析 (1)先算乘法,再算减法;
(2)先算除法,再算加法;
(3)先算减法,再算除法;
(4)利用加法交换律简算;
(5)利用减法的性质简算;
(6)先算除法,再算减法.
解答 解:(1)62-8×6
=62-48
=14;
(2)45+54÷6
=45+9
=54;
(3)(72-36)÷4
=36÷4
=9;
(4)871-381+129
=490+129
=619;
(5)1000-533-357
=1000-(533+357)
=1000-890
=110;
(6)440-400÷5
=440-80
=360.
点评 整数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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