题目内容
【题目】计算
(﹣)÷ 6﹣+2.4×÷ (﹣÷2)×
75%×[(100%﹣)×25%] ×+÷ 53.5×3.6+53.6×6.4﹣53.5.
【答案】(1)10;
(2)3.2;
(3);
(4)0.1125;
(5);
(6)482.14.
【解析】
试题分析:(1)、(5)、(6)根据乘法分配律进行简算;
(2)先算小括号里面的乘法,再算小括号里面的加法,再算除法,最后算减法;
(3)先算小括号里面除法,再算小括号里面的减法,最后算乘法;
(4)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外面的乘法.
解:(1)(﹣)÷
=(﹣)×28
=×28﹣×28
=16﹣6
=10;
(2)6﹣+2.4×÷
=6﹣(+0.8)÷
=6﹣1.4÷
=6﹣2.8
=3.2;
(3)(﹣÷2)×
=(﹣)×
=×
=;
(4)75%×[(100%﹣)×25%]
=75%×[×25%]
=75%×0.15
=0.1125;
(5)×+÷
=×+×
=×(+)
=×1
=;
(6)53.5×3.6+53.6×6.4﹣53.5
=53.5×(3.6﹣1)+53.6×6.4
=53.5×2.6+53.6×6.4
=139.1+343.04
=482.14.
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