题目内容

【题目】计算下面各题,怎样简便怎样算

18﹣÷+

20.5×+

33.7×+2.3÷

4×[÷]

【答案】1720.42;(3741

【解析】

试题分析:(18﹣÷+,先算除法,再根据加、减法的运算性质简算;

20.5×+),运用乘法分配律简算;

33.7×+2.3÷,把除数转化为乘它的倒数,再运用乘法分配律简算;

4×[÷],先算小括号里面的减法,再算中括号里面的除法,最后算乘法.

解答:解:(18﹣÷+

=

=

=

=8

=7

20.5×+

=

=0.3+0.12

=0.42

33.7×+2.3÷

=3.7×

=3.7+2.3×

=6×

=7

4×[÷]

=[]

=[]

=

=1

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