Question

Utilizând reguli de calcul cu puteri scrie cât mai simplu:
a) -2^3•(-2)^2•(-7)^5
b) (-2)^6•(-5)^6•(+7)^6
c) [12^7:(-4)^7]^3:3^20
d) [(-3)^5•5^5]^2:(-15)^8 e) [11^3•(-11)^5]^4:11^20

Answer 1

a.) -2³ (-2)² $-7^{5}$=$2^{5}$(-$7^{5}$=$) -14^{5}$
b.) $10^{6}$$7^{6}$=$70^{6}$
c.) -$3^{7}$=$3^{21}$⇒$3^{21}$:$3^{20}$=3
d.)-$15^{10}$:($-15^{8}$)=$15^{2}$
e.) -$11^{24}$:$11^{20}$=$11^{4}$