= 2x4/3x3 x 3x5/4x4 x 4x6/5x5 x.....x 49x51/50x50
= 2x4x3x5x4x6x...49x51/ 3x3x4x4x5x5...50x50
= 2x51/3x50
= 17/25
= 2x4/3x3 x 3x5/4x4 x 4x6/5x5 x.....x 49x51/50x50
= 2x4x3x5x4x6x...49x51/ 3x3x4x4x5x5...50x50
= 2x51/3x50
= 17/25
Tính: 8/9 x 15/16 x 24/25 x...x 2499/2500
Tính nhanh.
8/9 x 15/16 x 24/25 x...x 2499/2500
/ là dấu gạch phân số
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
Bài 2: Tính nhanh:
a) \(\dfrac{3}{4}\cdot\dfrac{8}{9}\cdot\dfrac{15}{16}\cdot\dfrac{24}{25}\cdot.....\cdot\dfrac{120}{121}\cdot\dfrac{143}{144}\)
b)\(\dfrac{5}{9}\cdot\dfrac{21}{25}\cdot\dfrac{45}{49}\cdot\dfrac{77}{81}\cdot.....\dfrac{357}{361}\cdot\dfrac{437}{441}\)
ai làm đúng mk dùng 3nick mk tick cho :))))
9 - 3 x ( X - 9 ) = 6
4 + 6 x ( X + 1 ) 70
\(\dfrac{X}{13}+\dfrac{15}{26}=\dfrac{46}{52}\)
\(\dfrac{11}{14}-\dfrac{3}{X}=\dfrac{5}{14}\)
5 x ( 3 + 7 x X ) = 40
X x 6 + 12 : 3 = 120
X x 3,7 + X x 6,3 = 120
( 15 x 24 - X ) : 0,25 = 100 : \(\dfrac{1}{4}\)
71 + 65 x 4 = \(\dfrac{X+140}{X}\)+ 260
( X +1 ) + ( X + 4 ) + ( x + 7 ) + ...... + (X + 28 ) = 155
đây là bài tìm X
tính:
\(2\dfrac{3}{13}\) x \(\dfrac{26}{58}\) x 4 x \(2\dfrac{15}{24}\) x \(\dfrac{8}{21}\)
tính:
\(2\dfrac{3}{13}\) x \(\dfrac{26}{58}\) x 4 x \(2\dfrac{15}{24}\) x \(\dfrac{8}{21}\)
\(\dfrac{21}{24}\)x\(\dfrac{2}{11}\):\(\dfrac{9}{8}\)=.......
\(\dfrac{17}{9}\)x\(\dfrac{5}{6}\):\(\dfrac{12}{13}\)=.......