y﹦|4x-x²|去绝对值后是y=-x²+4,还是y=x²-4x?

求y=(4x-绝对值(x))/(根号(3x-x²+4))的定义域 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y 去括号(4x-3y)-[-(3-x)+(x-y)]-5x 还是去括号4xy²-3x²y-{3x
若(1+X)²+Y+1的绝对值=0 则4x-3y分之2x-y等于? X-Y=4,绝对值X+绝对值Y=7,求X+Y= (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) x²+xy/(x-4y)(x+y),其中x=4,y=-1 函数y=[ x-4]+[ x-3] [ ]是绝对值符号 已知x,y为实数,且y=√2x-3+√3-2x+2x,求4x-y²的绝对值 (x+y)²+4(x+y)-5