Question

\(5\dfrac{3}{7}-3\dfrac{2}{9}+3\dfrac{4}{7}-2\dfrac{7}{9}\)

Giá trị biểu thức trên là:

Answer 1

\(=\dfrac{38}{7}-\dfrac{29}{9}+\dfrac{25}{7}-\dfrac{25}{9}\\ =\left(\dfrac{38}{7}+\dfrac{25}{7}\right)-\left(\dfrac{29}{9}+\dfrac{25}{9}\right)\\ =9-6\\ =3\)

Answer 2

\(=5+\dfrac{3}{7}+3+\dfrac{4}{7}-3-\dfrac{2}{9}-2-\dfrac{7}{9}\)

=9-5-1

=3

Answer 3

`5(3)/(7)-3(2)/(9)+3(4)/(7)-2(7)/(9)`

`=(5(3)/(7)+3(4)/(7))-(3(2)/(9)+2(7)/(9))`

`=(5+3+(3)/(7)+(4)/(7))-(3+2+(2)/(9)+(7)/(9))`

`=(8+1)-(5+1)`

`=3`

Answer 4