解方程:y^2+4=54(y-5)^2=16x^2+2x-4=0(y-2)^2=2(y-2)
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
解方程{2x+y=2、-x+y-5
方程2分之x+y+2分之x-y=7,4(x+y)-5(x-y)=2
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
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*
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
微积分方程求解e^x + (e^x cot y + 2y csc y)y' = 0
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y