4x+3y=27y=2x-12x+3y=-45x+2y=1

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4x+3y=27y=2x-12x+3y=-45x+2y=14x+3y=27y=2x-12x+3y=-45x+2y=14x+3y=27y=2x-12x+3y=-45x+2y=14x+3y=27y=2x-

4x+3y=27y=2x-12x+3y=-45x+2y=1
4x+3y=27
y=2x-1
2x+3y=-4
5x+2y=1

4x+3y=27y=2x-12x+3y=-45x+2y=1
4x+3y=27
y=2x-1
x=3 y=5
2x+3y=-4
5x+2y=1
x-1 y=-2

1. 4x+3y=27 1式
2x-y=1 2式
2式乘以3 加上 1式得10x=30 x=3
把x=3代入 2式得y=5
2. 2x+3y=-4 3式
5x+2y=1 4式
3式乘以2 减去 4式乘以3 得-11x=-11 x=1
把x=1代入 3式得 y=-2

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)= 12y(x-y)^2-8(x-y)^3=? 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)=11 4(x+y)+3(x-y)=9 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值