X/2+Y/3=13/2 (1)
X/3-Y/4=3/2 (2)
由1化解得 X=(39-2Y)/3 (3)
由2化解得 X=(18+3Y)/4 (4)
3代入4得 (39-2Y)/3 =(18+3Y)/4
Y=6
将Y=6代入3)得 X=9
x/2+y/3=13/2,3x+2y=39,9x+6y=147
x/3-y/4=3/2,4x-3y=18,8x-6y=36,17x=183,x=183/17,y=142/17
{2/x+3/y=2/13①{3/x-4/y=2/3②
解;化简{3x+2y=13③{4x-3y=18④
③×3 9x+6y=39⑤
④×2 8x-6y=36⑥
⑤+⑥ 17x=75
x=17/75
(大括号内,例:①②应在一个大括号里)