x²-y²-5x-5y=-12 2x+y=0 求:x=?y=?解方程组
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
不解方程组{2x+y=5,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
x²-5x+y²-2y=0 10x+4y=29 解方程组
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4
解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2
解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6