{4X+3Y=11 X+2Y=4}

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{4X+3Y=11 X+2Y=4}
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{4X+3Y=11 X+2Y=4}
{4X+3Y=11 X+2Y=4}

{4X+3Y=11 X+2Y=4}
4X+3Y=11（1） X+2Y=4（2）
由（2）得4X+8Y=16（3）
（3）-（1）得5Y=5
Y= 1
把 Y= 1代入（2）得X=2

{X=2 ,Y=1}

4X+3Y=11-----1
X+2Y=4----2
4x+8y=16----2*4---3
5y=5 -----(3-1) y=1
x+2=4 x=2

Y=1
x=2

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= {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 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 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? x+y=11 2x+4y=42 3y+x=31 求x y