Question

1.rut gon roi tinh                                                  hai muoi tam phan ba muoi lam nhan cho muoi lam phan bay muoi hai cong cho muoi bay phan bon muoi hai

Answer 1

28/35 x 15/72 + 17/42 =

4/5 x 5/24 + 17/42 =

20/120 + 17/42 =

1/6 + 17/42 =

7/42 + 17/42 = 24/42 = 4/7

Tk mk nha !

Answer 2

\(\frac{28}{35}\cdot\frac{15}{72}+\frac{17}{42}\)

=\(\frac{4}{5}\cdot\frac{5}{24}+\frac{17}{42}\)

=\(\frac{1}{6}+\frac{17}{42}\)

=\(\frac{4}{7}\)

Answer 3

ta có 28/35 = 4/5   ;   15/72 = 5/24     ;    17/42 = 17/42

 4/5 x 5/24 + 17/42

= 2/21 + 17/42

= 4/42+17/42

= 21/42

= 1/2