计算:(-1/2ab^2)^2(-3a^2b-2ab+b^2)
计算ab/(a+b-1)(a+b)+ab/(a+b)(a+b+1)+ab/(a+b+1)(a+b+2)+.+ab/(a+
计算 (-2ab)^3(5a^2b-1/2ab^2+1/4b^3)
计算:[(ab).(a^2b^2)]^2
计算:a2-2ab/-ab+b2÷(a2/a-b÷2ab/2b-a)
a+b/2ab
2AB/A+B
计算 (a^2b-ab-a+1)/(ab^2+3ab-b-3)÷(a^2+a_2)/(b^2+b-6)
计算:[(a+b)^2-4ab][(a-b)^2+4ab]-(a^2-b^2)^2
计算:(a^2+3ab+b^2)(a^2-3ab+b^2)=
计算(a^3-4a^2b-a+4ab^2)/a(a-2b+1)
计算:2/3a²-1/2ab+3/4a²+ab-b²
计算:[(a-b)(a+b)]^2-(a^2+ab+b^2)(a^2-ab+b^2)+(4a^2b^2)(b-1)(b+