lời giải:
a, 8.(x - 5) +17=17
=> 8 .(x - 5) = 0
=> x - 5 = 0
=> x = 5
b,125 - 5.(3x - 1) = `5^5` : `5^3`
= 125 - 5.(3x - 1) = `5^2`
=> 125 - 5.(3x - 1) = 25
=> 5.(3x - 1) = 100
=> 3x - 1 = 20
=> 3x = 21
=> x = 7
c, `4^(x+1)` + `4^0` = 65
=> `4^(x+1)` + 1 = 65
=> `4^(x+1)` = 64
=> `4^(x+1)` = `4^3`
=> x + 1 = 3
= >x = 2
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