\(1-\dfrac{5}{28}:3=1-\dfrac{5}{28}.\dfrac{1}{3}=1-\dfrac{5}{84}=\dfrac{79}{84}\)
Chúc bn học tốt
\(1-\dfrac{5}{28}:3=1-\dfrac{5}{28}.\dfrac{1}{3}=1-\dfrac{5}{84}=\dfrac{79}{84}\)
Chúc bn học tốt
Tính : 1/26+1/27+1/28+.......+1/50=1-1/2+1/3-1/4+.....+1/491/26+1/27+1/28+.......+1/50=1-1/2+1/3-1/4+.....+1/49
Tính
1, 14/7 + 5/9 + 4/9 - 2
2, 31/25 + ( 15/16 - 6/15 ) + 2/3
3, 23/28 - ( 23/28 - 1/3 ) + 2/3
4, 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90
1,Tính
A, 14/7 + 5/9 + 4/9 - 2
B, 31/25 + ( 15/16 - 6/15 ) + 1/16
C, 23/28 - ( 23/28 - 1/3 ) +2/3
D, 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90
1 - 15/28 : 3
B=4/3+10/9+28/27+...+3^98+1/3^98
15/x-1/3=28/51
Cho biểu thức:
B=\(\dfrac{28^{28}+28^{24}+28^{20}+...+28^4+1}{28^{30}+28^{28}+28^{26}+...+28^2+1}\)
Tính giá trị biểu thức B
B=4/3+10/9+28/27+...+3^98+1/3^98
Tính
1. 3/4 + 3/4.7 + 3/7.10 + 3/ 10.13 + 3/13.16 + 3/16.19 + 3/19.22 + 3/22.25
2. A = ( 1 - 1/21 ) * ( 1 - 1/28 ) * ( 1 - 1/36 ) *....* ( 1 - 1/1326 )