4-12(x-y)+9(x-y)² =(2-3x+3y)²
已知4x²-9y²=12,2x-3y=3,求x,y 谢谢啦
已知2x-3y=-4,求4x²+8x+12y-9y²的值
4x+5y=105,2x+3y=178,x,y等于
1.4x-3y=6 2/y=12 2.y/5+x=4 3.xy-9y=4 3x+6y=4 4.x+y=9 x²
(3x-y)²-2x(4x-5y)-(x+2y)²
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
9y=3x-(x-1),4(x+y)-(2x+4)=8y
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?