4⼀7-2⼀9+3⼀7-2⼀9,简便计算

2025-01-04 00:07:20
推荐回答(3个)
回答1:

4/7-2/9+3/7-2/9
=(4/7+3/7)-(2/9+2/9)
=1-4/9
=5/9
望采纳

回答2:

4/7-2/9+3/7-2/9
=(4/7+3/7)-(2/9+2/9)
=1-4/9
=5/9

回答3:

4/7-2/9+3/7-2/9
=4/7+3/7-2/9-2/9
=(4/7+3/7)-(2/9+2/9)
=1-4/9
=5/9