4x-3y=11 2x+y=13

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4x-3y=11 2x+y=13
4x-3y=11 2x+y=13

4x-3y=11 2x+y=13
4x-3y=11 （1）
2x+y=13 （2）
（2）×2-（1）得
5y=15
y=3
代入2x+y=13
2x+3=13
x=5
∴﹛x=5,y=3是原方程组的解

一式减去二式的两倍得
-5y=-15
y=3
x=5

由第二个式子得到
y=13-x，带入到第一个式子中得到
4x-3(13-x)=11
x=50/7
y=41/7

2*(2x+y)=2*13
4x+2y=26
4x-3y=11
两个式子相减得5y=15
y=3
x=(13-3)/2
x=5

是想要解方程吗？解出来 x=5,y=3，是初一的代数二元一次方程的解法啊，解法如下：

3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 {x=y-3 {x+y=11 {2x+y=13 {3x-2y=81.{x=y-3 {x+y=112.{2x+y=13 {3x-2y=8 {x-y=2,4(x-y)-y=5 {4x-3y=11,2x+y=13