题目内容
脱式计算. 172-32×5 |
72÷24+36 | 24×(524-489) | 450÷(18-9) |
分析:(1)先算乘法,再算减法;
(2)先算乘法,再算加法;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先算小括号里面的减法,再算括号外的除法.
(2)先算乘法,再算加法;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先算小括号里面的减法,再算括号外的除法.
解答:解:(1)172-32×5,
=172-160,
=12;
(2)72÷24+36,
=3+36,
=39;
(3)24×(524-489),
=24×35,
=840;
(4)450÷(18-9),
=450÷9,
=50.
=172-160,
=12;
(2)72÷24+36,
=3+36,
=39;
(3)24×(524-489),
=24×35,
=840;
(4)450÷(18-9),
=450÷9,
=50.
点评:本题考查了简单的四则混合运算,关键是找清楚运算的顺序,根据运算顺序逐步求解即可.
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