Question

有没有人知道这个题怎么做啊？在线等。急！需要过程

Answer 1

①5/14+1/3+3/14
=(5/14+3/14)+1/3
=4/7+1/3
=19/21
②5/6+3/4-1/3
=10/12+9/12-4/12
=5/4
③15/16-(5/12+1/6)
=90/96-56/96
=34/96
=17/48

Answer 2

5/14+1/3+3/14
=5/14+3/14+1/3
=8/14+1/3
=4/7+1/3
=12/21+7/21
=19/21

5/6+3/4-1/3
=5/6-1/3+3/4
=5/6-2/6+3/4
=3/6+3/4
=1/2+3/4
=2/4+3/4
=5/4
=1又1/4

15/16-(5/12+1/6)
=15/16-(5/12+2/12)
=15/16-7/12
=45/48-28/48
=17/48

Answer 3

先通分再加减

Answer 4

5/14+1/3+3/14
=5/14+3/14+1/3
=8/14+1/3
=4/7+1/3
=12/21+7/21
=19/21
5/6+3/4-1/3
=5/6-1/3+3/4
=5/6-2/6+3/4
=3/6+3/4
=6/12+9/12
=15/12
=1又1/4
15/16-(5/12+1/6)
=15/16-(5/12+2/12)
=15/16-3/12
=15/16-1/4
=15/16-4/16
=11/16

Answer 5

过程如下

愿对你有帮助