10x=3,10y=4,则10x-y=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知实数x,y满足|x|+x+y=10、x+|y|-y=12,则x+y的值?
已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)=
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
解方程组X+Y/2=3X-2Y=10+6X+Y/4
若x和y互为相反数,则3x-10+3y+y/5x=
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
1.x+x+x+y+y=6.4 y+y+y+x+x=7.1 x= ( ) y=( ) 2.1,4,7,10,13……这串
第一道:已知X的平方+Y的平方-4X+10Y+29=0.求分式X+Y/X-Y+X-Y/X+Y的值.
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0