M a= x+y/2
a) x= 5,(6)=5 intregi si 6/90=56/90=28/45
0,75=75/100=15/20=3/4
x= (28/45- 15/4+ 3/4) × 3/2
x= (28/45 -12/4)
x= 112-540/180=-428/180=107/45
y=(1/12 la -1 )+ √166,64 :27/10 √166,64=√16664/100=√16664/√100=2√4166/10=√4166/5
y=12+ √4166/5 :27/10
y=12 +√4166/5 ×10/27
y=12 +5√4166/27
y=27×12+√1466 totul pe 27
y=324+5√4166
Maritmetica = 324+5√4166/27 +107/45 totul supra 2
mai departe te descurci :)