用简便方法计算二又1⼀5-4⼀7-3⼀7。一又5⼀6-2⼀9-7⼀9。二又4⼀9-3⼀11-4⼀9

2025-04-03 16:48:19
推荐回答(1个)
回答1:

2又1/5-4/7-3/7
=2又1/5-(4/7+3/7)
=2又1/5-1
=1又1/5
1又5/6-2/9-7/9
=1又5/6-(2/9+7/9)
=1又5/6-1
=5/6
2又4/9-3/11-4/9
=2又4/9-4/9-3/11
=2-3/11
=1又8/11