题目内容
脱式计算. 16×5×7 |
360+25×4 | (26+74)÷5 |
120-360÷4 | 4×(287-132) | 75+25×4. |
分析:按照整数的四则混合运算法则计算,先算乘除、后算加减,有括号的先算括号里面的.
解答:解:16×5×7
=80×7
=560;
360+25×4
=360+100
=460;
(26+74)÷5
=100÷5
=20;
120-360÷4
=120-90
=30;
4×(287-132)
=4×165
=660;
75+25×4
=75+100
=175.
=80×7
=560;
360+25×4
=360+100
=460;
(26+74)÷5
=100÷5
=20;
120-360÷4
=120-90
=30;
4×(287-132)
=4×165
=660;
75+25×4
=75+100
=175.
点评:1.一个算式里,如果含有两级运算,要先做第二级运算,后做第一级运算.
2.一个算式里,如果有括号,要先算小括号里的.
2.一个算式里,如果有括号,要先算小括号里的.
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