👤
Cristinavasile
a fost răspuns

a) 15/21-6/12+12/21 b) 5/6 - 7/15 -27/49 c) 5/7 : 15/42 d) ( 7/3) totul la 1 x (7/3) x[( 7/3) tot la 2] totul la 1

Răspuns :

XKz
[tex] \frac{15+12}{21}- \frac{6}{12} = \\ \frac{27}{21} - \frac{6}{12}= \\ \frac{9}{7} - \frac{6}{12}= \\ \frac{2*9-7*1}{14}= \\ \frac{11}{14 } [/tex]