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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