Question

Answer 1

lỗi

Answer 2

lỗi

Answer 3

\(=\dfrac{2}{5}+\dfrac{7}{3}=\dfrac{41}{15}\)

Answer 4

Answer 5

2/5 - 5/3 . (-21)/15 = 2/5 - (-105)/45 = 144/45 = 38/15

Answer 6

?

Answer 7

= 2/5 - (-7/3)
= 2/5 + 7/3
= 41/15