2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
问题描述:
2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
答
(x+y)/2+(x-y)/3=6 ① 4(x+y)-5(x-y)=2 ② ①*8得 4(x+y)+8/3(x-y)=48 ③ ③-②得 (8/3+5)(x-y)=46 解得x-y=6 ④ 把x-y=6带入② 解得x+y=8 ⑤ ④与⑤联立方程组 解得x=7 y=1