1.(2a^2b)·(-1/2ab^2)^32.(-2/5xy^2z)·(-1/2y^2z^2)3.(2x)^3·y^3÷(16xy^2)4.(-a^2b)^4÷(-1/2ab^2)5.-2x^2y(3xy^2z-2y^2z)6.(-2/3a)(1/2a^2+1/6a+1/4)7.(x-3y)(x-1/2y)8.(-a-3b)(7a+2b)9.(9x-2y)(x+y)10.(-1/3p+1/2p)(-2/3p-1/4p)11.(-1/5a^3x^4-9/10a^2x^3)÷(-3/5

(a+b-2ab)(a+b-2)+(1-ab)^2 a+b/2ab 2AB/A+B a+b/2ab 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) ab^3+b^2+b-a+1 化简 b²-a²/a²-ab÷（a+(2ab+b²/a))·(1/a+1/b) 初二数学竞赛计算题,在线等!1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]4. [-ac/(a-b) (a-b+ab-a^2/a+b)乘以[a+1/a-b乘以(1+a/b)] (a^2b-ab-a+1)/(ab^2+3ab-b-3)÷(a^2+a_2)/(b^2+b-6) b/(a^2-ab)+c/(b^2-ab)+(a+b^2)/(a^2b-ab^2) (a-b)平方-2ab(b-a) (a-b)^3+2ab(a-b) 因式分解(a+b-2ab)(a+b-2)+(1-ab)(1-ab) ab+a+b+1-2ab=2ab,则a+b的值为? 1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=? 因式分解ab（ab+1）^2-ab（a+b）-a-b+1 急求!