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H5N1、H7N7 H5N1、H3N2 H3N2、H7N7 H9N2、H3N1 H3N2、H3N1
an=2n2+3n-1 an=n2+5n-5 an=2n3-3n2+3n-1 an=2n3-n2+n-2
|N1|=|N2|;|N3|=|N4| |N1|>|N2|;|N3|>|N4| |N2|<|N3|;|N3|<|N4| |N1|>|N2|;|N3|<|N4|
n1>n2>n3 n3>n2>n1 n2>n1>n3
N1<N2<N3=N4 N2=N1>N3=N4 N1>N2>N3=N4 N2>N1>N3=N4
N1=N2=N3 N1≠N2≠N3 N1=N3>N2 N1=N3
N1=N2=N3 N1≠N2≠N3 N1=N3>N2 N1=N3<N2
m=1,n=3 m=1,n=-3 m=-1,n=-3 m=-1,n=3
n(Na2CO3)=n(1/2Na2CO3) n(Na2CO3)=2n(1/2Na2CO3) 2n(Na2CO3)=n(1/2Na2CO3) 不确定
n2+2n+3 n2+2n-3 n2-2n+3 n2-2n-3
n+(n+1)+(n+2)+…+(2n-1)=n2 n+(n+1)+(n+2)+…+(2n-1)=(2n-1)2 n+(n+1)+(n+2)+…+(3n-2)=(2n-1)2 n+(n+1)+(n+2)+…+(3n-1)=(2n-1)2