9⼀17×1⼀7+5⼀17÷7= 2⼀5÷(3⼀4+2⼀5 )= 简便计算

2024-11-02 03:20:09
推荐回答(1个)
回答1:

9/17×1/7+5/17÷7
=9/17×1/7+5/17×1/7
=(9/17+5/17)×1/7
=14/17×1/7
=2/17

2/5÷(3/4+2/5 )

=2/5÷23/20
=2/5×20/23
=8/23