Répondre :
5^2 x 5^4=5^(2+4)=5^6
2,5^(-7) x (4,2)^(-7)=(2,5x4,2)^(-7)=10,5^(-7)
(-2)^3 x (-2)^5=(-2)²
6^5 x 6^(-8)=6^(-3)
(-4)^1 x (-4)^(-7)=(-4)^(-6)
(2/3)^(-3) x (2/3)^(-5)=(2/3)^(-8)
3^4 x 5^4=15^4
7^(-5) x 7^1=7^(-4)
2,5^(-7) x (4,2)^(-7)=(2,5x4,2)^(-7)=10,5^(-7)
(-2)^3 x (-2)^5=(-2)²
6^5 x 6^(-8)=6^(-3)
(-4)^1 x (-4)^(-7)=(-4)^(-6)
(2/3)^(-3) x (2/3)^(-5)=(2/3)^(-8)
3^4 x 5^4=15^4
7^(-5) x 7^1=7^(-4)