计算100²-99²+98²-97²+96²+··········+2²-1的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 04:31:44
计算100²-99²+98²-97²+96²+··········+2²-1的值
xRKN0= J2b"]( tAU+!ĆeUMۑfY%ͼP.~ޕ7wgM]xC:Vb融v10s'2k)IBvhWg5f.pqO'ojE7׷;W #SX )R RXUd<~OB?;)0ǖ0Z?тѧU8*@@;~FA(O3gTqe U|l-b_[lk

计算100²-99²+98²-97²+96²+··········+2²-1的值
计算100²-99²+98²-97²+96²+··········+2²-1的值

计算100²-99²+98²-97²+96²+··········+2²-1的值
原式=﹙100-99﹚×﹙100+99﹚+﹙98-97﹚×﹙98+97﹚+……+﹙2-1﹚×﹙2+1﹚
=100+99+98+97+…………+4+3+2+1
=﹙100+1﹚×100÷2
=5050

原式=(100-99)*(100+99)+(98-97)*(98+97)+···+(2-1)*(2+1)=100+99+98+···+2+1=100+(99+1)+(98+2)+···+(51+49)+50=100*50+50=5050

5050

=(100+99)*(100-99)+(98+97)*(98-97)+··········+(2+1)*(2-1)
=100+99+98+97+··········+2+1
=(100+1)+(99+2)+··········+(51+50)
=101*50
=5050