题目内容
【题目】(28分)
计算题
36×205﹣860
3600﹣102×25
1.2×5.5÷3﹣0.2
5÷(1+0.75×) 1﹣÷3×8 [4+(2.2﹣1)×]÷4.5
【答案】(1)6520 (2)1050 (3)2 (4)(5) (6)1.
【解析】
试题分析:(1)(2)先算乘法,再算减法;
(3)先算乘法,再算除法,最后算减法;
(4)先算乘法,再算加法,最后算除法;
(5)先算除法,再算乘法,最后算减法;
(6)先算减法,再算乘法,再算加法,最后算除法.
解:(1)36×205﹣860
=7380﹣860
=6520;
(2)3600﹣102×25
=3600﹣2550
=1050;
(3)1.2×5.5÷3﹣0.2
=6.6÷3﹣0.2
=2.2﹣0.2
=2;
(4)5÷(1+0.75×)
=5÷(1+0.25)
=×
=;
(5)1﹣÷3×8
=1﹣××
=1﹣
=;
(6)[4+(2.2﹣1)×]÷4.5
=[4+×]÷4.5
=[4+]÷4.5
=4÷4
=1.
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