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Phan Thế Nguyên Phước 65
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2022-04-23 22:37:58
P = 1/49+2/48+3/47+...+48/2+49/1
Cộng 1 vào mỗi p/s trong 48 phân số đầu , trừ phân số cuối đi 48 ta được
P=(1/49+1)+(2/48+1)+...+(48/2+1)+1
P= 50/49+50/48+....+50/2+50/50
Đưa phân số cuối lên đầu
P=50/50+50/49+50/48+...+50/2
=50.(1/50+1/49+1/48+...+1/4+1/3+1/2)
=50.S
VậyS/P=1/50
2022-02-07 09:00:55