已知y<3 化简 (y+3)×√y²-6y+9
已知代数式9-6y-4y²=7,则2y²+3y+7的值等于
例:已知代数式9-6y-4y ²=7,求2y ²+3y+7的值 由9-6y-4
已知4x²+y²-4x-6y+10=0,求(2/3√9x +y²√x/y³)-(
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知4x²+y²-4x-6y+10=0,求[(2/3)x√(9x)+y²√(x/y
已知4x²+y²-4x-6y+10=0,求(2/3√9x+y²√x/y³)-(x
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
已知x>0,y<0,化简:/3x-2y/-/3y-2x/
已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
1.5y+8y-6y=2y-3