递等式计算题5/6－3/4+1/3 11/12－(1/6－1/8) 7/12－(3/4－1/2) 1/2－(3/4－3/8）

5/6－3/4+1/3（通分）
=10/12-9/12+4/12
=1/12+4/12
=5/12

11/12－(1/6－1/8)
=11/12-1/6+1/8（通分）
=22/24-4/24+3/24
=18/24+3/24
=21/24（约分）
=7/8

7/12－(3/4－1/2)
=7/12-3/4+1/2（通分）
=7/12-9/12+6/12
=13/12-9/12
=4/12
=1/3

1/2－(3/4－3/8）
=1/2-3/4+3/8
=8/16-12/16+6/16
=14/16-12/16
=2/16
=1/8

5/6－3/4+1/3
=10/12-9/12+4/12
=(10-9+4)/12
=5/12
11/12－(1/6－1/8)
=11/12-2/12+1/8
=9/12+1/8
=3/4+1/8
=6/8+1/8
=7/8
7/12－(3/4－1/2)
=7/12-(3/4-2/4)
=7/12-1/4
=7/12-3/12
=4/12
=1/3
1/2－(3/4－3/8）
=1/2-(6/8-3/8)
=1/2-3/8
=4/8-3/8
=1/8

5/6－3/4+1/3
=10/12-9/12+4/12
=5/12
11/12－(1/6－1/8)
=22/24-4/24+3/24
=21/24
=7/8
7/12－(3/4－1/2)
=7/12-1/4
=1/3
1/2－(3/4－3/8）
=1/2-3/8
=1/8
如果本题有什么不明白可以追问,