\(2x+\dfrac{7}{99}.\dfrac{8}{15}=\dfrac{106}{99}.\dfrac{8}{15}\)
=> \(2x+\dfrac{8}{15}.\dfrac{7}{99}-\dfrac{8}{15}.\dfrac{106}{99}=0\)
=> \(2x+\dfrac{8}{15}\left(\dfrac{7}{99}-\dfrac{106}{99}\right)=0\)
=> \(2x+\dfrac{8}{15}.\left(-1\right)=0\)
=> \(2x-\dfrac{8}{15}=0\)
=> \(2x=\dfrac{8}{15}\)
=> \(x=\dfrac{8}{15}:2=\dfrac{4}{15}\)
1. Tinh cac tong sau :
A = 1 + 3 + 7 + ... + 101
M = 16 - 18 + 20 - 22 + 24 - 26 + ... + 64 - 66 + 68
H = ( 1 + 2 + 3 + ... + 99 ) x ( 13 x 15 - 12 x 15 - 15 )
G = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + 13 + 14 - ... + 301 + 302
2. Tim x biet :
a) 1 + 2 + 3 + 4 + ... + 99 + 100 + 2 x X = 5052
Ai giai duoc chi tiet cac bai nay minh tick lien 10 tick hi hi hi !!!!!!
3/4 x 8/9 x 15/16 x ... x 99/100 = ?
3/4 x 8/9 x 15/16 x .....x 99/100
3/4 x 8/9 x 15/16 x ..... x 80/81 x 99/100
3/4 x 8/9 x 15/16 x.....x 80/81 x 99/100
3/4 x 8/9 x 15/16 x ... x 80/81 x 99/100
4/3 x 9/8 x 16/15 x 25/24 x...........x 100/99
4/3 x 9/8 x 16/15 x 25/24 x ... x 100/99
3/4 x 8/9 x 15/16 x...x 99/100
