A *a2=new
A a2=new A("a2");是什么意思
=IF(COUNTIF($A$1:A2,A2)>0,COUNTIF($A$1:A2,A2))
(a2-4/a2-4a+3)×(a-3/a2+3a+2=?
已知a2+3a+1=0 求 1+1/a a2+1/a2
=IF(A2>90,A ,IF(A2>80,B ,C ))
ab(a2+b2)x2-(a+b2)x+(a2-b2)/(a2+b2)=0
若a2-3a+1=0,求a2+a2/1的值
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
a new
设|A|是三阶矩阵,A=(a1,a2,a3)则|A|=?A.|a1-a2,a2-a3,a3-a1| B.|a1-a2,a
设a=根号3-3,求[(a+1/a2-a)+(4/1-a2)]除以(a2+2a-3/a2+3a)的值
已知A=-a-1,B=a2+a,C=2a2-5a-1