计算:(a+1)(a²-2a+3) 5y²-(y-2)(3y+1)-2(y+1)(y-5)
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:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
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)(
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、(a-b)^3*(a-b)^4*(b-a)^3 2、y^(m+2)*y*y^(m-1)+y^(2m+2) 3、
计算:1:(2a-3b-c)^2 2:(3y-y-1)(y-3x-1) 3:(2x+y-z)(z-2x+y)
计算,不要过程(-2x)(-3x²)²-3a(2a²-5a-1)(2x+3y)(2x-3y
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
已知集合A{y/y平方-(a*a+a+1)y+a(a*a+1)>0} B{y/y=1/2x平方-x-5/2,0≤x≤3}
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)