题目内容
【题目】怎样算简便就怎样算.
(1) ﹣(1﹣ )÷9
(2)3.6×( + ﹣ )
(3)6.7× +3.3÷
(4)1÷ ﹣ ÷1
(5) ÷( ﹣ )×
(6) ÷(5﹣ ﹣ )
【答案】
(1)解: ﹣(1﹣ )÷9
= ﹣ ×
= ﹣
= ;
(2)解:3.6×( + ﹣ )
=3.6× +3.6× ﹣3.6×
=2.4+0.6﹣2.7
=0.3;
(3)解:6.7× +3.3÷
=6.7× +3.3×
=(6.7+3.3)×
=10×
=6;
(4)解:1÷ ﹣ ÷1
=4﹣
= ;
(5)解: ÷( ﹣ )×
= × ×
= ;
(6)解: ÷(5﹣ ﹣ )
= ÷3
= ×
= .
【解析】(1)先算减法,再算除法,最后算减法;(2)利用乘法分配律简算;(3)运用乘法分配律进行简便运算即可;(4)先算除法,再算减法;(5)先算减法,再算除法,最后算乘法;(6)先算减法,再算除法.
练习册系列答案
相关题目