Câu 1: Thực hiện phép tính.
a) \(\frac{-1}{8}\)+ \(\frac{-5}{3}\) b) \(\frac{-6}{35}\). \(\frac{-49}{54}\) c) \(\frac{-4}{5}\): \(\frac{3}{4}\)
Câu 2: Tính nhanh.
a) \(\frac{31}{17}\)+ \(\frac{-5}{13}\)+ \(\frac{8}{13}\)-\(\frac{14}{17}\) b) \(\frac{-5}{7}\). \(\frac{2}{11}\)+ \(\frac{-5}{7}\).\(\frac{9}{11}\)+ \(\frac{5}{7}\)
Bài 1
a)( -1/8)+(-5/3)=(-3/24)+(-40/24)=-43/24
b) (-6/35). (-49/54)=(-1/5).(-7/9)
=7/45
c) (-4/5):3/4=(-4/5).4/3=-16/15
Bài 2
a) 31/17+(-5/13)+8/13-14/17
=(31/17-14/17)+(8/13-5/13)
= 1 + 3/13
= 16/14
b) (-5/7).2/11+(-5/7).9/11+5/7
=(-5/7).(2/11+9/11)+5/7
=(-5/7). 1 +5/7
= (-5/7) + 5/7
= 0
Chúc bn hok tốt
có thế cx lười, t méc cô =))