=-3/31-6/17+1/25-28/31-11/17-1/5
=-1-1-4/25=-2-4/25=-54/25
\(\dfrac{-3}{31}\) +\(\dfrac{-6}{17}\)+\(\dfrac{1}{25}\)+\(\dfrac{-28}{31}\)+\(\dfrac{-11}{17}\)+\(\dfrac{-1}{5}\)
a) \(\dfrac{-3}{17}\left(\dfrac{2}{3}+\dfrac{3}{17}\right)\)
b) \(D=\dfrac{-3}{31}+\dfrac{-6}{17}+\dfrac{1}{25}+\dfrac{-28}{31}+\dfrac{-11}{17}+\dfrac{-1}{5}\)
B= - 3/31 + -6/17 + 1/25 + -28/31 + -11/17 + -1/5
chi tiết giúp nhaaaaaaaa
Tinh bang cach hop li
\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\)\(\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)
1) Tính nhanh
A= 4/7 + 3/4 + 2/7 + 5/4 + 1/7
B= -3/31 + -6/17 + 1/25 + -28/31 + -11/7 + -1/5
Tinh bang cach hop ly
\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\) \(\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)
(-(3)/(31))+ (-(6)/(17)) +( 1)/(2) + (-(28)/(31)) + (-(11)/(17)) + (-(1)/(6))
Dùng tính chất để tính
a) 17/5 . -31/125 . 1/2 . 10/17 . -1/23
b) (11/4 . -5/9 - 4/9 . 11/4) . 8/33
c) (17/28 + 18/29 - 19/30 - 20/31) . (-5/12 + 1/4 + 1/6)
d) -1/4 . 15^2/11 + 68/4 . -1/11
e) -9/25 . 53/3 - (-3/5)^2 .22/3
Bài 1 tính bằng cách hợp lý a, -5/7+3/4+-1/5+-2/7+1/4 b, -3/31+-6/17+1/29+-28/31+-11/17+-1/5
