34) Câu sai: a, c, d, f
a) (-5)².(-5)³=(-5)^2+3=(-5)^5
c) (0,2)^10:(0,2)^5=(0,2)^10-5=(0,2)^5
d) $[(\frac{-1}{7})^2]^4=(\frac{-1}{7})^{2.4}=(\frac{-1}{7})^8$
f) 8^10/4^8=(2^3)^10/(2^2)^8=2^3.10/2^2.8=2^30/2^16=$2^{30-16}$=2^14
35)
a) (1/2)^m=1/32=(1/2)^5<=>m=5
b) 343/125=(7/5)^n
Ta có: 343/125=7^3/5^3=(7/5)^3<=>n=3
36)
a) 10^8 .2^8=(10.2)^8=20^8
b) 10^8:2^8=(10:2)^8=5^8
c) 25^4.2^8=5^8.2^8=10^8
d) 15^8.9^4=15^8.3^8=45^8
e) 272:253=(33)2:(52)3= 33.2: 52.3= 3^6:5^6=(3/5)^6
37) Hình.
