题目内容
【题目】怎样算简便就怎样算.
1.3﹣+8.7﹣
0.75×467+52.3×7.5+7.5
25×(+)×17
÷[+×﹙﹣﹚].
【答案】7;750;117;.
【解析】
试题分析:①1.3﹣+8.7﹣,根据加、减法的运算性质简算;
②0.75×467+52.3×7.5+7.5,应用乘法分配律简算;
③25×(+)×17,应用乘法分配律简算;
④÷[+×﹙﹣﹚].先算小括号里面的减法,再算中括号里面的乘法,然后算中括号里面的加法,最后算除法.
解:①1.3﹣+8.7﹣
=(1.3+8.7)﹣()
=10﹣3
=7;
②0.75×467+52.3×7.5+7.5
=7.5×46.7+52.3×7.5+7.5
=7.5×(46.7+52.3+1)
=7.5×100
=750;
③25×(+)×17
=
=100+17
=117;
④÷[+×﹙﹣﹚]
=[]
=÷[]
=÷
=
=.
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