计算(3ab^2+1)/(a-b)^2 - (1+3a^2b)/(b-a)^2
计算(a^3-4a^2b-a+4ab^2)/a(a-2b+1)
计算ab/(a+b-1)(a+b)+ab/(a+b)(a+b+1)+ab/(a+b+1)(a+b+2)+.+ab/(a+
1:计算2(a+b)^2/(a+b)-3(a+b)/(a+b).
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/a+b.
计算:[(a-b)(a+b)]^2-(a^2+ab+b^2)(a^2-ab+b^2)+(4a^2b^2)(b-1)(b+
计算(3a-2b)(9a*a+6ab+4b*b)-(3a+2b)(9a*a-6ab+4b*b)
计算:(b/a)^2÷(a/b)-b^3/a^3(a-b) ÷ 1/a-b
计算,快(2a-b)(4a^2+b^2+2ab)-a(3a-b)(3a+b)
计算1)(a-2b)^2+4b(a-b);2)(-2a^2b^3)÷(-6ab^2)*(-4a^2b)
计算a+9b/3ab-a+3b/3ab=( ) a^2b^3/(2a^-1b^2)^-3=( )
计算:(-a^2b)^3-(a^3)^2b^3+(-a)^4*(ab)^2*(-2b)
计算 (a^2b-ab-a+1)/(ab^2+3ab-b-3)÷(a^2+a_2)/(b^2+b-6)