已知x-3y+5=0,则7-2y+6y=_____
1个回答
2*(X-3Y+5)=2x-6y+10=0
则-2x+6y-10=0,则-2x+6y-10+17=17,则7-2x+6y=17
相关问题
已知方程组 4x-3y-6z=0 x+2y-7z=0 ,则 2xy+3y7z-6zx / x²+5y²
已知x+2y-3z=0,5x-6y+7z=0(方程组),则x:y:z=
已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?
已知5X-4Y-7Y=0,4X-3Y-6Z=0,则X:Y:Z=?
已知{2x-5y=0 则x+y+z/2y= x-6y+3z=0
已知4x-3y-6z=0,x+2y-7z=0,则2xy+3yz-6zx / x^2+5y^2+7z^2=_______
已知4x-3y-6z=0,x+2y-7z=0,则x²+5y²+7z²分之2xy+2yz-6
已知(2x+5y-4)+|x+5y-7|=0,则x=____,y=____.
已知4x-3y-6z=0,x+2y-7z=0.则x:y:z=_:_:_
已知4x-3y-6y=0,x+2y-7z=0(xyz≠0),求2x+3y+6z/x+5y+7z的值.