求和:1-2+3-4+5………+(2n-1)-2n=
问题描述:
求和:1-2+3-4+5………+(2n-1)-2n=
求和:1-2+3-4+5………+(2n-1)-2n=
答
=(1-2)+(3-4)+.+(2n-1-2n)=-n对吧,赶紧好评啊
求和:1-2+3-4+5………+(2n-1)-2n=
求和:1-2+3-4+5………+(2n-1)-2n=
=(1-2)+(3-4)+.+(2n-1-2n)=-n对吧,赶紧好评啊