计算 help(1)(-1/2a^2b)(2/3b^2-1/3a+1/4)(2)(3x-1)(x+3)(3)(4x^2-
计算 help(1)(-1/2a^2b)(2/3b^2-1/3a+1/4)(2)(3x-1)(x+3)(3)(4x^2-
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
计算:(1)(x平方/x-2+4/2-x)除以x+2/x (2)a+b-a平方/a-b-b平方/b-a+1
计算 (-2x)(x-1)-(x-2)(x+3) [4(a-b)^m-1]*[-3(a-b)^2m]
(3x/x-2-x/x+2)*x^2-4/x(用两种方法计算) 若x-3/(x+1)(x-1)=A/x+1+B/-1求A
若分式4X-9/3x平方-x-2=A/3x+2-B/X-1(A B为常数),则A B的值?
1/4(a-b)^2x(b-a)^3x(-a-b)^5x(2a+2b)^4
计算:1、(2a-3b)(2a+3b)(-4a²-9b²) 2、(x-2y+3)(x+2y-3)
3x/6x^2z a+b/a^2-b^2 x^2+2x+1/x^2+x 3x-6/x^2-4x+4
分式计算,(1)a²-4b²\3ab² × ab\a-2b (2)x²-x\x-
1.已知3x-4/(x-1)(x-2)=A/x-1+B/x-2,求实数A,B.
数学题目(因式分解)3x^2-2x+1/39(a+b)^2+30(a-b)(a+b)+25(a+b)^2(x^2-2x)