根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=

题目

根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=

答案

（x+y)-2(x-y)=11①
4(x+y)+3(x-y)=9②
②-①×4：11(x-y)=-35
（x-y)=-35/11
代入①：(x+y)-2(-35/11)=11
(x+y)=11-70/11
(x+y)=51/11