解方程组(x-3y)/2=(2x+y)/3=7
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解方程组 (x+2)² -(y-3)²=(x+y)(x-y) x-3y=2
解方程组:x+y/2+x-y/3=6,(x+y)+5(x-y)=38 谢.
解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3(x-y)=15
解方程组:x+y=9,3(x+y)+2x=33要过程
解方程组(X+2)的平方减(Y-3)的平方=(X+Y)(X-Y)与X-3Y=2组成方程组
解方程组 y=2x x+y=3
解方程组{(x+2)^2-(y-3)^2=(x+y)(x-y) {x-3y=2 解方程组{3x+2y=7 {2x+3y=18解不等式组{x-2
2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
解方程组:3(x-5)=3y-6 x-y/3-x+2y/6=2解方程组:3(x-5)=3y-6 x-y/3-x+2y/6=2
解方程组:4(x+1)=3(y+3) x-2y=7y-6x/3
解方程组(3x+2y)/4=x+3/4y=3(x-2)+y
求方程组x^2+xy+y^2=109 x^3-y^3=218的解(x,y)
解方程组x-y=-1 ,(x+y)²+2(x+3y)=7
x²+2xy+y²=9 (x-y)²-3(x-y)+2 =0 解方程组.
解方程组 x-5y=0 { (x,y为正整数) 3X+2y=17
解方程组(1)2x+3y=12 ,2x+y=0 (2)x+y=7,3(x+y)-7y=7