已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知:(x+2)²+|x+y-10|=0,求3x²y-[5x²y-﹙2xy-x²
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知x²-10x+25+|y-3|=0,求2xy+xy分之x²+x的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知x:y=3:2,求(x²+3xy)/(xy+2xy)