AJUTOOOOOORRRRRRRRRR

Răspuns:
Explicație pas cu pas:
a)7/3·4/7+9/5·1/3-1/12=4/3-3/5-1/12=(20·4-3·12-3)/60=41/60
b) (2/3)^(5·4):(2/3)^17=(2/3)^(20-17)=(2/3)³=8/27