计算① (5+3x)² ②(-2x-5)² ③(2x+y-3)² ④(x+3y)²
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
计算① (5+3x)² ②(-2x-5)² ③(2x+y-3)² ④(x+3y)²
(3x-y)²-2x(4x-5y)-(x+2y)²
计算:(3x-y)2-(2x+y)2+5x(y-x)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
分式计算2x/(5x-3)除3/(25x²-9)乘x/(5x+3) 通分x-y/(2x+2y)与xy/(x+y
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
计算下面各题 [2(x²y)²-5x³y+3x²y²]÷x²
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²