题目内容

19.脱式计算.
72÷8+125                              
37×2-80
320+26×27                             
1500-125×8.

分析 (1)先算除法,再算加法;
(2)(4)先算乘法,再算减法;
(3)先算乘法,再算加法.

解答 解:(1)72÷8+125
=9+125
=134;
                              
(2)37×2-80
=74-80
=-6;

(3)320+26×27
=320+702
=1022;
                             
(4)1500-125×8
=1500-1000
=500.

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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