(X-Y)/3-(X-2Y)/4=(X-3)/12
→(4X-4Y)/12-(3X-6Y)/12=(X-3)/12
→(X+2Y)/12=(X-3)/12
→2Y/12=(-3)/12
→Y=(-3)/2
8.已知x、y的關係式為 求y=?(A) -3/2(B) -1/2 (C) 1(..-阿摩線上測驗