因为等差数列的前n项和
符合Sn=n(a1+an)/2
所以am/bm
=2am/2bm
=[a1+a(2m-1)]/[b1+b(2m-1)]
=(2m-1)[a1+a(2m-1)]/(2m-1)[b1+b(2m-1)]
=S2m-1/S2m`-1
不懂再问,
因为等差数列的前n项和
符合Sn=n(a1+an)/2
所以am/bm
=2am/2bm
=[a1+a(2m-1)]/[b1+b(2m-1)]
=(2m-1)[a1+a(2m-1)]/(2m-1)[b1+b(2m-1)]
=S2m-1/S2m`-1
不懂再问,