=1/2 . (1 - 1/3 + 1/3 - 1/5 + ... + 1/99 - 1/100)
= 1/2 . (1 - 1/100)
=1.2 . 99 /100
= 99/200
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\(\frac{101+100+99+98+.....+5+4+3+2+1}{101-100+99-98+...+5-4+3-2+1}\)
1)tính nhanh: 1/1×3+1/3×5+1/5×7+....+1/99×101
tính nhanh
A= 1/1*3+1/3*5+1/5*7+.....+1/99*101
(101+100+99+...+3+2+1) : (101-100-99..-3-2-1)
B= 3/1*3 + 3/3*5 + 3/5*7+ ...+3/ 99* 101
Tính nhanh
M=(1+1/1×3)×(1+1/2×4)×(1/3×5)×...×(1+1/99×101)
101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1
A=3/1*3+3/3*5+...+3/99*101
A=101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1
B=3737.43/4343.37
1 ) Tinh tong :
A = 1/1*3 + 1/3*5 + 1/5*7 + ...... + 1/99* 101
B = 1 + 1/3 + 1/6 + 1/10 + ...... + 1/630