判断幂函数y=x^2, y=(0.5)^x, y=4x^2, y=x^5+1, y=(x-1)^2, y=a^x(x>1

判断幂函数y=x^2, y=(0.5)^x, y=4x^2, y=x^5+1, y=(x-1)^2, y=a^x(x>1 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 已知4x=9y求(1)x+y/y (2)y-x/2x 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y 函数,y=3x/(x^2+x+1) ,x 函数y=3x/(x^2+x+1) （x 函数y=x+2x-1 函数y=2x+x+1 判断函数y=2x-1