(1)3x+4y=16 (2)5x-6y=33
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(1)3x+4y=16 (2)5x-6y=33
(1){x+2y=0,3x+4y=6(2){5x+6y=16,7x-9y=5(3){9x-11y+1=0,4x-5y-3
5(X-3Y)-6=2X+1,3(X+Y)=4(2X-Y)+16
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
3分之2(X-Y)-4分之X+Y=-1,6(X+Y)-4(2X-Y)=16
解方程组:2(x-y)/3-x+y/4=-1 ,6(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
(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)
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