Question

(-7supra 3) totul la puterea 6 ×(9supra49)totul la puterea 2​

Answer 1

Un număr ridicat la o putere PARĂ devine pozitiv. La impară devine negativ.

(a/b)^n=a^n/b^n

(-7/3)^6=7^6/3^6

9/49=(3/7)^2

(9/49)^2=[(3/7)^2]^2=(3/7)^4=3^4/7^4

(-7/3)^6*(9/49)^2=7^6/3^6*3^4/7^4=7^2/3^2=(7/3)^2=49/9