Răspuns:
ex19
a) 3^15:27^4=3^15:3^12=3^3=27
b)4^10:16^4 =4^10:4^8=4^2=16
c)2^105:4^51=2^105:2^102=2^3=8
d)4^3×8^2:16^3=2^6×2^6:4^6=2^6×2^6:2^12=1
e)16^15:32^12=2^60:2^60=1
f)25^30:125^20=5^60:5^60=1
ex20
a)2^3×3^3=6^3
b)5^9×2^9=10^9
c)8^10×9^10=72^10
d)2^3×3^3×5^3=30^3
e)a^x×b^x×c^x =(abc) ^x
f) 2^3×a^3×b^3=8×a^3×b^3
ex23
a) 36^5:18^5=2^5
b) 84^6b14^6=6^6
c) (2^9×3^9):6^9=(2×3)^9:6^9=6^9:6^9=1
d) 42^10:(2^10×3^10×7^10)= 42^10 : (2×3×7)^10=42^10 :42^10=1
semnul "^" înseamnă la puterea.
succes!! :)))
