①X-3/4=5/8 解:X-3/4+3/4=5/8+3/4 X=5/8+6/8 X=11/8②X+2/7=2/3 解:X+2/7-2/7=2/3-2/7 X=14/21-6/21 X=8/21③X-1/6=3/8 解:X-1/6+1/6=3/8+1/6 X=9/24+4/24 X=13/24
x=11/8 x=8/21 x=13/24
X=11/8X=8/27X=13/24