Tính nhanh:\((\) \(\dfrac{1}{3}\)-\(\dfrac{1}{5}\)-\(\dfrac{1}{10}\)-\(\dfrac{1}{30}\))x(\(\dfrac{1}{21}\)+\(\dfrac{1}{210}\)+\(\dfrac{1}{2010}\))
tinh nhanh (1/21+1/210,+1/2010)*(1/3- 1/30-1/5-1/10)
Tính nhanh
(1/19 + 1/190 + 1/1900) * (1/4 - 1/40 - 1/8 - 1/10)
TÍNH NHANH
a) 3/16 + 4/15 + 5/16 + 1/15
b) 6/7 x 8/15 x 7/6 x 15/16
c) 19/20 x 13/21 + 9/20 x 8/21
d) (1+ 10/15 ) x (1+ 1/16 ) x ( 1+ 1/17 ) x ( 1+ 1/18 )
MINK ĐANG CẦN GẤP
Bài 1 : Tính nhanh :
a, 2/3 + 3/4 + 4/5 + 12/9 + 28/6 + 48/15.
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16 ;
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16 ;
d, ( 1 + 1/2 ) x ( 1 + 1/3) x ( 1 + 1/4 ) x...x ( 1 + 1/175)
(\(\frac{1}{21}\)+\(\frac{1}{210}\)+\(\frac{1}{2010}\))*(\(\frac{1}{3}\)-\(\frac{1}{30}\)-\(\frac{1}{5}\)-\(\frac{1}{10}\))
tính nhanh
A=1/3+1/8+1/15+1/24+1/35+1/48+1/63+1/80
B=1/4+1/10+1/18+1/28+1?40+1/54+1/70