已知数列an,bn为等差数列,An,Bn表示数列an,bn的前n项和,若a1=60,b1=40,A100+B100=0,求a100+b100
问题描述:
已知数列an,bn为等差数列,An,Bn表示数列an,bn的前n项和,若a1=60,b1=40,A100+B100=0,求a100+b100
答
a100+b100=-100
已知数列an,bn为等差数列,An,Bn表示数列an,bn的前n项和,若a1=60,b1=40,A100+B100=0,求a100+b100
a100+b100=-100