1、5x+6y=16 2、5x+4y=14
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
5(X-3Y)-6=2X+1,3(X+Y)=4(2X-Y)+16
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
3x+2y/4=2x+y/5=x-y+1/6
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
1、5x+6y=16 2、5x+4y=14
x+2y=-5&2x-5y=-1.3x=5y&2x-3y=-1 .2x+4y=11&3y-2y=3 .2x+3y=14&
(1){x+2y=0,3x+4y=6(2){5x+6y=16,7x-9y=5(3){9x-11y+1=0,4x-5y-3