Tính: 8/9 x 15/16 x 24/25 x...x 2499/2500
tìm kết quả tích sau:
A= \(\dfrac{8}{9}\)x\(\dfrac{15}{16}\)x\(\dfrac{24}{25}\)x...x\(\dfrac{2499}{2500}\)
= 2x4/3x3 x 3x5/4x4 x 4x6/5x5 x.....x 49x51/50x50
= 2x4x3x5x4x6x...49x51/ 3x3x4x4x5x5...50x50
= 2x51/3x50
= 17/25
Tính nhanh.
8/9 x 15/16 x 24/25 x...x 2499/2500
/ là dấu gạch phân số
\(\frac{8}{9}\). \(\frac{15}{16}\). \(\frac{24}{25}\). ..... . \(\frac{2499}{2500}\)
= \(\frac{2.4}{3.3}\). \(\frac{3.5}{4.4}\). \(\frac{4.6}{5.5}\). .... . \(\frac{49.51}{50.50}\)
= \(\frac{2.4.3.5.4.6.49.51}{3.3.4.4.5.5.....50.50}\)= \(\frac{2.51}{3.50}\)= \(\frac{17}{25}\)
Tinh nhanh: 8/9 X 15/16 X 24/25 X ... X 2499/2500
A =8/9 x 15/16 x 24/25 x.......x 2499/2500
B=( 1 -1/3) x (1-1/6)x (1- 1/10)x .....x ( 1- 1/780)
Tính nhanh nha các bạn ơi
Tính: 8/9 . 15/16 . 24/25 . ..... . 2499/2500
3^4*8^9*15^16*24^25*...2499^2500
A=8/9+15/16+24/25.......2499/2500
CTR : 3/4 + 8/9 + 15/16 + 24/25 +....+ 2499/2500 > 48
* Giúp mình với :(