Bài 1
\(a,=7^4\\\\ =3.5.3.5.3.5=3^3.5^3\\ \\ b,=a^8\\ \\ =a^3.b^2\\ \\ =\left(2^3\right)^5.2^3=2^{15}.2^3=2^{18}\\ c,=4^9\\ \\ =3^{15-5}=3^{10}\\ \\ =4^6:4^6=1\\ \\ =\left(3.4\right)^5=12^5\)
bài 1 :
a) = 74 = 3.5.152
b) = a8 = a3.b2 = 5122
c) =49 = 310 =1