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