Răspuns:
1. a)1+0+1+4+25=6+25=31
b) 5^21-5^21=0
c)6^2=36
d)7^56:7^54=7^2=49
2. 3^28:(3)^2^12+3^3-1×[729:243+27:(3×9-18)]
3^28:(3)^24+27-1×[3+27:(27-18)]
3^4+27-1×(3+27:9)
81+27-3+3
108-3+3
105+3=108
