题目内容
脱式计算.
17.68÷5.2+2.7×1.5 | 35.6-5×1.73 | (1.1-0.78)×(2.7-1.95) |
分析:(1)同时运算除法和乘法,再算加法;
(2)先算乘法,再算减法;
(3)先同时运算两个小括号里面的减法,再算括号外的乘法.
(2)先算乘法,再算减法;
(3)先同时运算两个小括号里面的减法,再算括号外的乘法.
解答:解:(1)17.68÷5.2+2.7×1.5,
=3.4+4.05,
=7.45;
(2)35.6-5×1.73,
=35.6-8.65,
=26.95;
(3)(1.1-0.78)×(2.7-1.95),
=0.32×0.75,
=0.24.
=3.4+4.05,
=7.45;
(2)35.6-5×1.73,
=35.6-8.65,
=26.95;
(3)(1.1-0.78)×(2.7-1.95),
=0.32×0.75,
=0.24.
点评:解决本题关键是找清楚运算的顺序,根据运算顺序逐步计算即可.
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