丁丁和宁宁合打一份稿件,丁丁打了八分之三,宁宁打了七分之二,没打

2025-05-13 22:28:57
推荐回答(3个)
回答1:

1-3/8-2/7
通分
=56/56-21/56-16/56
=(56-21-16)/56
=19/56
没打的占这份稿件的19/56。

回答2:

1-(3/8+2/7)
=1-(21+16)/56
=1-37/56
=19/56
还有19/56没有打

回答3:

1-3/8-2/7
=56/56-21/56-16/56
=19/56