Question

3)(7/30+8/45)+(2/45+1/30) 4)(5/24+11/60)+(13/60+1/24)​

Answer 1

$3)( \frac{7}{30} + \frac{8}{45} ) + ( \frac{5}{24} + \frac{11}{60} ) = \frac{22}{45}$

$1) \frac{7}{30} + \frac{8}{45} = \frac{21}{90} + \frac{16}{90} = \frac{37}{90} \\ 2) \frac{2}{45} + \frac{1}{30} = \frac{4}{90} + \frac{3}{90} = \frac{7}{90}$

$3) \frac{37}{90} + \frac{7}{90} = \frac{44}{90} = \frac{22}{45}$

4)

$( \frac{5}{24} + \frac{11}{60} ) + ( \frac{13}{60} + \frac{1}{24} ) = \frac{13}{20}$

$1) \frac{5}{24} + \frac{11}{60} = \frac{25}{120} + \frac{22}{120} = \frac{47}{120}$

$2) \frac{13}{60} + \frac{1}{24} = \frac{26}{120} + \frac{5}{120} = \frac{31}{120}$

$3) \frac{47}{120} + \frac{31}{120} = \frac{78}{120} = \frac{13}{20}$

Сократили дробь 78/120 на 6