12⼀7×1⼀9×5⼀9×3⼀7如何简便运算?

2025-04-02 13:07:16
推荐回答(3个)
回答1:

12/7×1/9×5/9×3/7
=12/7×1/9×5/3×1/7
=4/7×1/9×5/1×1/7
=20/441

回答2:

简便计算
12/7x1/9+5/9x3/7
=12/7x1/9+1/9x15/7
=(12/7+15/7)x1/9
=27/7x1/9
=3/7

回答3:

12/7x1/9+5/9x3/7

=12/7x1/9+1/9x15/7

=(12/7+15/7)x1/9

=27/7x1/9

=3/7