3a(a2+4a+4)-a(a-3)(3a+4)

15a2-{-4a2+[5a-8a2-（2a2-a）]+9a2-3a}2是平方 已知a2-a-6=0,则a2-2(a2-a+3)-1/2(a2-a-4)-a (a2-1)/(a2+2a+1)除以(a2-a)/(a+1) (a-2/(a+3)除以(a2-4)/(a2+6a+9) （a2-4/a2-4a+3）×（a-3/a2+3a+2=? ( a2-9)/(a2+6a+9) ÷(a-3) /(a2+3a) - (a-a2) /(a2-1), 已知实数a满足a2+2a-1=0求(1 /a+1)-(a+3/a2-1)*(a2-2a+1/a2+4a+3)的值 化简:(a2+a-2/(a2+4a+4)+a/(a2+2a))(a-4/a)并求值,其中a是4-根号3的小数部分. 设a=根号3-3,求[(a+1/a2-a)+(4/1-a2)]除以(a2+2a-3/a2+3a)的值 3a(a2+4a+4)-a(a-3)(3a+4) 8a-a^3+a^2+4a^3-a2-7a-6解答! 说明(a-1)(a2-3)+a2(a+1)-2(a3-2a-4)-a的值与a无关. a-2/a+3除以a2-4/a2+6a+9 [1-(6+3a)/(a2+4a+4)]÷[(4a-4)/(a2+2a)] [1-(6+3a)/(a²+4a+4)]÷[(4a-4)/(a²+2a)]a2是a的平方的意思 计算:3/(a2-9)-7/(a2+4a-21) (a2-3a+2)x2+(2a2-4a+1)xy+(a2-a)y2因式分解如题 a3-2a2-4a+3因式分解 化简分式：(2a2+3a+2)/a+1-(a2-a-5)/a+2-(3a2-4a-5)/a-2+(2a2-8a+5)/a-3 化简分式：(2a2+3a+2)/a+1-(a2-a-5)/a+2-(3a2-4a-5)/a-2+(2a2-8a+5)/a-3