1\2a^3b+2a^2b^2+2ab^3分解因式

(a-b)^3+2ab(a-b) ab^3+b^2+b-a+1 a+b/2ab 2AB/A+B a+b/2ab (a-b+ab-a^2/a+b)乘以[a+1/a-b乘以(1+a/b)] 1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=? (a+b-2ab)(a+b-2)+(1-ab)^2 急……ab/(a+b-1)(a+b) + ab/(a+b)(a+b+1) + ab(a+b+1)(a+b+2) + …… + ab/(a+b+98)(a+b+99) + ab/(a+b+99)(a+b+100) 计算ab/(a+b-1)(a+b)+ab/(a+b)(a+b+1)+ab/(a+b+1)(a+b+2)+.+ab/(a+b+98)(a+b+99)+ab/(a+b+99)(a+b+100) 1/a+1/b=3则a-ab+b/a+2ab+b值是? 如果a+b=3,ab=-1,那么(a+b)2-a-b+ab=? (a^2b-ab-a+1)/(ab^2+3ab-b-3)÷(a^2+a_2)/(b^2+b-6) a*b=a+b-2ab (3*2)*1 (a-b)(3ab+2a²b-b³) ab/a+b=3 a-2ab+b/2a-3ab+2b? (a-b)平方-2ab(b-a) 已知a,b满足a+b=5,a-b=1,求ab,a^2+b^2-3ab