(2分之X+3)+(3分之Y+5)=7 两边同乘以63(X+3)+2(Y+5)=423X+2Y=42 ------------------(1) (3分之X-4)+(5分之2Y-3)=2两边同乘以155(X-4)+3(2Y-3)=305X+6Y=59 ------------------(2) (1)×3-(2),解得X=2.5Y=7.75
