Urgenttt!!!!!! Dau coroanaaaa!!!!!!!!!!!!!

Răspuns:
Explicație pas cu pas:
6.
a) 2/7 x 35/12 = 5/6
b) 5/12 x 54/84 = 45/504 = 5/56
c) 52/49 x 56/13 = 224/49 = 32/7
d) 9/5 x 85/33 = 51/11
e) 43/42 x 90/86 = 15/14
f) 43/31 x 62/95 = 86/95