Răspuns:
Explicație pas cu pas:
((145/12+0.1+4/15)*15-6*28)*4/11 =75/11
(12*11-47)*21/11=1785/11
R= 75/1785= 10/238
((6-2)/30)/((61-53+2)/5) = 4/6/10=1/15
((20-9)/60/2*3)/((1.88*25+53)/25/80)=
=((11/40)/(100/25)/80=11/2
= 5*(1/15-11/2)= -163/6
