bài 9:
a) 48 - 3(x+5) = 24
=> 3(x+5) = 24
=> x+5 = 8
=> x = 3
b) `2^(x-1)` - `2^x` = 32
=> `2^x` : 2 - `2^x` = 32
=> `2^x` : (2 - 1) = 32
=> `2^x` : 1 = 32
=> `2^x` = 32
=> `2^x` = `2^5`
=> x = 5
c) (15+x) : 3 = `3^15` : `3^12`
=> (15+x) : 3 = `3^3`
=> 15+x = `3^4`
=> 15+x = 81
=> x = 66
d) 250 - 10(24 - 3x) : 15 = 244
=> 10(24 - 3x) : 15 = 6
=> 10(24 - 3x) = 90
=> 24 - 3x = 9
=> 3x = 15
=> x = 5
e) 4x + 18 : 2 = 13
=> 4x + 9 = 13
=> 4x = 4
=> x = 1
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