Răspuns:
a) 420,b)2280,c)210
Explicație pas cu pas:
a) 8+5*(20+3*26-15)-3=8+5*(20+78-15)-3=8+5*83-3=8+415-3=423-3=420
b) (150+12*8-(28-10))*10=(150+12*8-18)*10=(150+96-18)*10=(246-18)*10=228*10=2280
c) 5+5*(5+2*(5+25-6))=5+5*(5+2*(30-6))=5+5*(5+2*24)=5+5*(5+48)=5+5*43=5+215=210