1.a^2-1+b^2-2ab=(a-b+1)( )2.x^2-4y^2+2x-4y=(x+2y+2)( )3.a^2(a-3)+(3-a)=( )( )( )4.(2a-b)^2+8ab=5.6xy^2-9x^2y-y^3= 6.4(x+y+z)^2-9(x-y-z)^2= 7.32a（x^2+x）^2-2a=8.(2+1)(2^2+1)(2^4+1)(2^8+1)=9.t^4-2t^2+1=10.a^3+a^2+1/4a=11.(a+b)^2-4(a=b)+4= 12.(a-b)^3

a(a+b)(a-b)-a(a+b)(a+b),其中(a+b)=1,ab=-1/2 a(a-1)-(a×a-b)=-5,求(a×a+b×b)÷2-ab a/b=2 ,(a*a-ab+b*b)/(a*a+b*b)= 若a/b=2 则a*a-ab+b*b/a*a+b*b等于? 如果a/b=2则a*a-ab+b*b/a*a+b*b求值 1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=? 求证：A/（AB+B^2）-B/(AB+A^2)=1/B-1/A 如果a+b=3,ab=-1,那么(a+b)2-a-b+ab=? 1/a+1/b=3则a-ab+b/a+2ab+b值是? (a-b+ab-a^2/a+b)乘以[a+1/a-b乘以(1+a/b)] 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) a*b=a+b-2ab (3*2)*1 a-b=1 ab=2 a+b=? (a+b-2ab)(a+b-2)+(1-ab)^2