Question

a ) ( 5 supra 6 + 11 supra 9 ) : 74 supra 9 b ) ( 19 supra 45 - 7 supra 30 ) : 34 supra 5 VA ROG FRUMOS SCRIETI SI REZOLVAREA .DAU COROANA !

Answer 1

a)5/6 + 11/9 =

Numitor comun 18

(5•3+11•2)/18 =

37/18

37/18 • 9/74 =

1/4

b)19/45 - 7/30 =

Numitor comun 90

(19•2-7•3)/90 =

17/90

17/90 • 5/34 =

1/32

Answer 2

A )

$( \frac{5}{6} + \frac{11}{9} ) \div \frac{74}{9} =$

$( \frac{15}{18} + \frac{22}{18} ) \div \frac{74}{9} =$

$\frac{37}{18} \div \frac{74}{9} =$

$\frac{37}{18} \times \frac{9}{74} =$

$\frac{1}{2} \times \frac{1}{2} =$

$\frac{1}{4}$

b)

$( \frac{19}{45} - \frac{7}{30} ) \div \frac{34}{5} =$

$( \frac{38}{90} - \frac{21}{90}) \div \frac{34}{5} =$

$\frac{17}{90} \div \frac{34}{5} =$

$\frac{17}{90} \times \frac{5}{34}$

$\frac{2}{18} \times \frac{1}{34} =$

$\frac{36}{35}$