1.
a)
25 * 625 = 5^x
5² * 5^4 = 5^x
5^6 = 5^x
x = 6
b)
8 * 2 * 16 = 2^x
2³ * 2 * 2^4 = 2^x
2^8 = 2^x
x = 8
c)
27^6 * 3^5 = 3^x
(3³)^6 * 3^5 = 3^x
3^18 * 3^5 = 3^x
3^23 = 3^x
x = 23
2.
a)
5 : 2/7 = 5 * 7/2 = 35/2 = 17 1/2
b)
9/11 : 5 = 9/11 * 1/5 = 9/55
c)
(1 - 1/3)³ = (2/3)³ = 8/27
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