题目内容
【题目】用简便方法计算下面各题.
0.75+++0.375
356×+420÷+
(+)÷
32.48﹣(39.5+2.48)
【答案】①0.75+++0.375=2
②356×+420÷+=666
③(+)÷=25
④32.48﹣(39.5+2.48)=﹣9.5
【解析】
试题分析:①把分数化成小数,根据加法交换律及结合律计算;
②420÷=420×,根据乘法分配律进行计算;
③除以,等于乘4,再根据乘法分配律进行计算;
④根据减法性质进行计算.
解:①0.75+++0.375
=0.75+0.625+0.25+0.375
=(0.75+0.25)+(0.625+0.375)
=1+1
=2
②356×+420÷+
=356×+420×+
=(356+420+1)×
=777×
=666
③(+)÷
=(+)×24
=×24+×24
=9+16
=25
④32.48﹣(39.5+2.48)
=32.48﹣39.5﹣2.48
=32.48﹣2.48﹣39.5
=﹣9.5
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