由x/2+y/3=5/2 ==> x=5-2y/3 (1)
将(1)式代入 x/3-y/4=3/2 中 , 即 (5-2y/3)/3 - y/4=3/2
等式两边同乘以36 得 60-4y-9y=54 ===> y=6/13
再将y=6/13 代入(1)式中,得 x=61/13
x/2+y/3=5/2 ==》 将整式*1/3 ==》 x/6+y/9=5/6 , x/3-y/4=3/2 ==》 将整式*1/2 ==> x/6-y/8=3/4 ,将 x/6+y/9=5/6 减去 x/6-y/8=3/4 ==> y/9+y/8=5/6-3/4 17y/72=1/12 y=72/204 y=6/17 代入 x/2+y/3=5/2 ==> x/2+(6/17)/3=5/2 y=81/17