1) X-Y=1 Y=3/4X+12) Y=4X Y=-3X3) 3X+Y=6 2X+Y=3/24) X+4Y=-1/2 -2X-3Y=15) X-Y=-3/2 -2X+5Y=-4.5

来源：学生作业帮助网编辑：六六作业网时间：2024/12/27 18:44:51

1)X-Y=1Y=3/4X+12)Y=4XY=-3X3)3X+Y=62X+Y=3/24)X+4Y=-1/2-2X-3Y=15)X-Y=-3/2-2X+5Y=-4.51)X-Y=1Y=3/4X+12)Y

1) X-Y=1 Y=3/4X+12) Y=4X Y=-3X3) 3X+Y=6 2X+Y=3/24) X+4Y=-1/2 -2X-3Y=15) X-Y=-3/2 -2X+5Y=-4.5
1) X-Y=1 Y=3/4X+1
2) Y=4X Y=-3X
3) 3X+Y=6 2X+Y=3/2
4) X+4Y=-1/2 -2X-3Y=1
5) X-Y=-3/2 -2X+5Y=-4.5

1) X-Y=1 Y=3/4X+12) Y=4X Y=-3X3) 3X+Y=6 2X+Y=3/24) X+4Y=-1/2 -2X-3Y=15) X-Y=-3/2 -2X+5Y=-4.5
⑴将y=3/4x+1代入x-y=1 得x=8 y=7
⑵两式相减,得x=0 y=0
⑶两式相减,得x=9/2 y=-15/2
⑷将式1乘2,得2x+8y=-1 再将两式相加,得y=0 x=-1/2
⑸将式1乘2,得2x-2y=-3 再将两式相加,得y=-5/2 x=-4

1) x-(3/4x+1)=1, 1/4x=2, x=4, y=7
2) x=0, y=0
3)(3x-2x)+ (y-y)=6-3/2, x=4 1/2, y=7 1/2
4) x=-1/2-4y, 2x(1/2+4y)-3y=1, 8y=0, y=0, x=-1/2
5) 2x-2y = -3, 2x+(-2x)+(-2y+5y)=-7.5, 3y=-7.5, y=-2.5, x=1

1) x＝8, y＝7
2) x＝y＝0
3) x＝9/2, y＝-15/2
4) x＝-1/2, y＝0
5) x＝-4, y＝-5/2

{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? 解方程组{2(x-y)/3 - x+y/4=-1 6(x+y)-41(x-y)=12 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 先化简再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 4(x+2)=1-5y 4(x+y)-3(x-y)=12 先化简再求值; 解方程组 x(x-y)-y(x+y)+2xy 其中x=2 ,y=-22.x[x-x(x-1)],其中x=-2解方程组4x+3y=12x-y=32.y+1=2x 4x-y=2 3.2x+2y=0 2x-y+24=0 [(y-2x)(-2x-y)+4(x-2y)平方]/3y,其中x=1,y=-3 [(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3 y(x+y)+(x-y)²-（x+y）（x-y）,其中x=-1/3,y=3 先化简,再求值：[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2 (3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1, 9y=3x-(x-1),4(x+y)-(2x+4)=8y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y