( 1+ 1/2) x (1+ 1/3) x (1+ 1/4) x...x (1+ 1/98) x (1+ 1/99)
= 3/2 x 4/3 x 5/4 x … x 99/98 x 100/99
= (3 x 4 x 5 x … x 99 x 100) / 2 x 3 x 4 x … 98 x 99
= 100/2
= 50
( 1+ 1/2) x (1+ 1/3) x (1+ 1/4) x...x (1+ 1/98) x (1+ 1/99)
= 3/2 x 4/3 x 5/4 x … x 99/98 x 100/99
= (3 x 4 x 5 x … x 99 x 100) / 2 x 3 x 4 x … 98 x 99
= 100/2
= 50
1. Tính nhanh:
M = 1 x 1/2 + 1/2 x 1/3 + 1/3 x 1/4 +...+ 1/99 x 1/100
1. Tính nhanh:
M = 1 x 1/2 + 1/2 x 1/3 + 1/3 x 1/4 +...+ 1/99 x 1/100
cíu :))
a) Thực hiện phép tính
( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x ( 1 - 1/5 ) x ... x ( 1 - 1/99 )
b) Tìm X biết
( X +1/2 ) + ( X +1/6 ) + ( X +1/12 ) + ( X +1/20 ) + ... + ( X +1/90 ) = 99/10
(2+4+6+...+100) - (1+3+5+...+99) = ?
1 x 2 + 2 x 3 + 3 x 4 + ... + 99 x 100 = ?
3 x 4 + 4 x 5 + 5 x 6 + ... + 149 x 150 = ?
1 + (1 + 2) + ( 1 + 2 + 3) + (1 + 2 + 3 + 4) + ....... + (1 + 2 + 3 + ... + 99)
----------------------------------------------------------------------------------------------------------- ( gạch ngang phân số )
1 x 99 + 2.98 + 3.97 + ...... + 99 x 1
Tính ( 1 + 1/2) x ( 1 + 1/3) x ( 1 + 1/4) ... ( 1 + 1/99)
Tính : ( 1 + 1/2) x ( 1 + 1/3) x ( 1 + 1/4) x ...... x ( 1+ 1/99)
Tính :
( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x ... x ( 1 - 1/99 ) x ( 1 - 1/100 )
Tính nhanh:
(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/99)
2 tính : a) 1+1/4+1/8+1/16 =
=
b) 2-1/8-1/12-1/16 =
=
c) 4/99 x 18/5 : 12/11 + 3/5 =
=
d) ( 1-3/4 ) x ( 1+ 1/3 ) : ( 1- 1/3 ) =
=
tính:(1+1/2)x(1+1/3)x(1+1/4)x.......x(1+1/98)x(1+1/99)
giúp tui đi các anh em thiện lành:(