Question

求第5道计算题,顺便麻烦看一下第3和第4小题,

Answer 1

5.原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+…+(1/98-1/99)+(1/99-1/100)

=1*1/1-1/1*2-1/1*3+1/1*3-1/1*4+…1/1*98-1/1*99+1/1*99-1/1*100

=1-1/1*100

=99/100

不好意思,电脑不好打分数