1.x/2+y/3=13/2
2.x/3-y/4=3/2
由1式:x=13-2y/3
将x其代入2式:(13-2y/3)/3-y/4=3/2
13/3-2y/9-y/4=3/2
通分:156-8y-9y=54
17y=102
y=6
x=13-2*6/3=9
x/2+y/3=13/2 各项 *6 => 3X+2Y=39 => 各项*3=> 9X+6Y=117
x/3-y/4=3/2各项 *12 =>4X-3Y=18=> 各项*2=> 8X-6Y=36
相加 17X=153 => X=9 代回 27+2Y=39 => Y=6 => (X,Y)=(6,9)...ANS