Question

{CLASA A V- A - PUTERILE}

D si F va rog!

Answer 1

$d) {3}^{6} + 18 \times {3}^{4} = ( {3}^{2} + 18) \times {3}^{4} = (9 + 18) \times {3}^{4} = 27 \times {3}^{4} = {3}^{3} \times {3}^{4} = {3}^{3 + 4} = {3}^{7}$

$f) {5}^{21} - 4 \times {5}^{20} = (5 - 4) \times {5}^{20} = 1 \times {5}^{20} = {5}^{20}$

Answer 2

$d) 3^6+18\cdot 3^4=3^4(3^2+18)=3^4(9+18)=3^4\cdot 27=3^4\cdot 3^3=3^7\\f)5^{21}-4\cdot 5^{20}=5^{20}(5-4)=5^{20}$