若2^x=10,16^y=30求2^x-4y的值

若2^x=10,16^y=30求2^x-4y的值. 若2^x=10,16^y=30求2^x-4y的值 若x*x+y*y=x+y-1/2,求x,y的值如题 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 若x^2-y^2=48,x+y=16,求x^2+y^2 若x²+2x+y²-6y+10=0求x y 若x.y满足x^2+4x+y^2-10y+29=0.求x+y的值 若x^2+y^2-10x-6y+34=0,求（x-y)/(x+y)的值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若X^2+y^2+2x-6y+10=0,求y^2x-x^2011的值 2Y：30%=3X：50%求X:Y 若(x+y)(x+y-1)-2=0,求x+y的值求 若x^2-4x+y^2-10y+29=0,求x^2y^2+2x^3y^2+x^4y^2的值 已知x+y=-10,xy=16求x²+y²,(x-y)²,(x+2)(y+2),x²-xy+y².求值！ 若x*x+4*y*y+2*x-4*y+2=0,求5*x*x+16*y*y的算术平方跟 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,n的值