已知Ix+2I+(y+3)²=0求6xy²-【3x²y-(2x²y-xy
已知Ix-2I+(y+1)²=0,你能求出代数式5x²+3xy-5y²-2xy+4y
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
1.已知(x+3)的平方+Ix-y+10I=0,求代数是5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2x
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知x+y=4.x-y=6.求代数式xy(y²+y)-y²(xy+2x)-3xy的值
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x、y的方程组3(x²+y²)-5xy=6,2(x²+y²)+xy=17,求
已知(x+2)²+│y-1│=0,求7x²y-3+2xy²-6x²y-2xy
已知x/y=3,求x²+2xy-3y²/x²-xy+y²