Question

Answer 1

\(\dfrac{5}{7}-\dfrac{6}{5}\)x\(\dfrac{45}{42}\)

=\(\dfrac{5}{7}-\dfrac{9}{7}\)

=\(\dfrac{-4}{7}\)

Answer 2

bằng âm 4 phần 7

Answer 3

\(=\dfrac{5}{7}-\dfrac{270}{210}\\ =\dfrac{5}{7}-\dfrac{9}{7}=\dfrac{5-9}{7}=\dfrac{-4}{7}\)

Answer 4

\(=\dfrac{5}{7}-\dfrac{3}{7}=\dfrac{2}{7}\)

Answer 5

5/7-6/5×45/42

=5/7-9/7

=-4/7