Các câu hỏi tương tự
Tính nhanh
a.(1+1/2)×(1+1/3)×(1+1/4)×...×(1+1/98)×(1+1/99).
b.1/2×2/3×3/4×...×97/98×98/99×99/100
A=1/2+1/3+1/4+....+1/100
B=99/1+98/2+97/3+....+2/98+1/99
99/1+98/2+97/3+................+2/98+1/99
1/2+1/3+1/4+.......................+1/99+1/100
1*2*3+2*3*4+3*4*5+....+97*98*99+98*99*100 = ?
1+ 99/98 -98/97+ 1/97*98
99/98 - 98/97 + 1/97*98
Tính nhanh: (1+2+3+4+5+.......+97+98+98+99)x100/2x50:2500
1 + 2 + 3 + .............. + 97 + 98 + 99 + 100
100-99+98-97+............+4-3+2-1