Question

Câu 1:thực hiện phép tính

a)(-5)+11+17+(-3)

b)17/8-5/8+(-7)/8+11/8

c)4/11+(-5)/13+7/11+(-8)/13

d)(-9)/23.(5/3)^2+1/46.(-2)^2

Answer 1

a) 20

b) 2

c) 0

d) -1

Like  nha bạn !!

Answer 2

a; (-5) + 11 + 17 + (-3)

= - 5 + 11 + 17 - 3

= - (5 + 3) + (11 + 17)

= - 8 + 28

= 20

Answer 3

b; \(\dfrac{17}{8}\) - \(\dfrac{5}{8}\) + \(\dfrac{-7}{8}\) + \(\dfrac{11}{8}\)

=  \(\dfrac{12}{8}\) - \(\dfrac{7}{8}\) + \(\dfrac{11}{8}\)

= \(\dfrac{5}{8}\) + \(\dfrac{11}{8}\)

= \(\dfrac{16}{8}\)

= 2

Answer 4

c; \(\dfrac{4}{11}\) + \(\dfrac{-5}{13}\) + \(\dfrac{7}{11}\) + \(\dfrac{-8}{13}\)

= (\(\dfrac{4}{11}\) + \(\dfrac{7}{11}\))  - (\(\dfrac{5}{13}\) + \(\dfrac{8}{13}\))

= \(\dfrac{11}{11}\) - \(\dfrac{13}{13}\)

 = 1 - 1

= 0

Answer 5

d; \(\dfrac{-9}{23}\).(\(\dfrac{5}{3}\))² + \(\dfrac{1}{46}\).(-2)²

= - \(\dfrac{9}{23}\).\(\dfrac{25}{9}\) + \(\dfrac{1}{46}\).4

= - \(\dfrac{25}{23}\) + \(\dfrac{2}{23}\)

= - \(\dfrac{23}{23}\)

= - 1