计算:a/(a+1)^2+1/(a+1)^2 ,2x/x^2+64y^2-1/x-8y
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)
计算:a/(a+1)^2+1/(a+1)^2 ,2x/x^2+64y^2-1/x-8y
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
计算:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-
计算:x-y分之x - x+y分之y + x²-y²分之2xy 计算:a-1分之2a+2 除以 (a
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算:3a(a²-2a+1)-2a²(a-3) (2x-3y)(x+y)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
(1/2)已知实数x,y,a满足:根号(x+y-8)+根号(8-x-y)=根号(3x-y-a)+根号(x-2y+a+3)
下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.
利用乘法公式计算 (3a+2)^2-(2a-1)^2 (x-y)(x+y)-(2x-y)^2 [(x+2)(x-2)]^
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)