计算:(1-a)(1+a)(a2+a+1)(a2-a+1)
=IF(COUNTIF($A$1:A2,A2)>0,COUNTIF($A$1:A2,A2))
1.计算阶行列式1+a1 a2 a3 .ana1 1+a2 a3 .ana1 a2 1+a3.an....a1 a2 a
(a+1)2+a2+(a2+a)2因式分解
(a2+a+1)(a2+a+2)-12因式分解
1/(a2-2a+1)-1/(a2+a-2)的计算结果
计算:(3a2+2a+1)-(2a2+3a-5)的结果是( )
(a2-1)/(a2+2a+1)除以(a2-a)/(a+1) (a-2/(a+3)除以(a2-4)/(a2+6a+9)
(a-1)-(3a2-2a+1)
已知a2+3a+1=0 求 1+1/a a2+1/a2
(a2-a)a2-2a-3÷a(a-3)=a(a-1)(a+1)(a
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
已知A=-a-1,B=a2+a,C=2a2-5a-1