即6x-3y+4x-12y=5
10x-15y=5
2x-3y=1 (1)
6x+2y-3x-3y=12
3x-y=12 (2)
(2)×3-(1)
9x-2x=36-1
7x=35
所以x=5
y=3x-12=3补充的问题会吗x－3/2＋y－2/3＝3两边乘63(x-3)+2(y-2)=18 (1)x－3/3＋y－2/2＝2两边乘62(x-3)+3(y-2)=12 (2)(1)+(2)5(x-3)+5(y-2)=30(x-3)+(y-2)=63(x-3)+3(y-2)=18 (3)(3)-(2)x-3=6则y-2=6-(x-3)=0所以x=9,y=2