a) x+ 3 = 10
=> x=10-3
=> x=7
vậy x=7
b) (3x - 4 ) : 23 = 64
=> 3x-4=64.23
=> 3x-4=26.23
=> 3x-4=29
=> 3x-4=512
=> 3x=512+4
=> 3x=516
=> x=516:3
=> x=172
vậy x=172
a) \(x+3=10\)
\(\Leftrightarrow x=10-3\)
\(\Leftrightarrow x=7\)
Vậy \(x=7\)
b) \(\left(3x-4\right):2^3=64\)
\(\Leftrightarrow3x-4=64.2^3\)
\(\Leftrightarrow3x-4=2^6.2^3\)
\(\Leftrightarrow3x-4=2^{6+3}\)
\(\Leftrightarrow3x-4=2^9\)
\(\Leftrightarrow3x-4=512\)
\(\Leftrightarrow3x=512+4\)
\(\Leftrightarrow3x=516\)
\(\Leftrightarrow x=516:3\)
\(\Leftrightarrow x=172\)
Vậy \(x=172\)
a) x + 3 = 10
-> x = 10-3
-> x = 7
Vậy x = 7
b) (3x - 4 ) : 2^3 = 64
-> (3x - 4 ) : 8 = 64
-> 3x - 4 = 64 . 8
-> 3x - 4 = 512
-> 3x = 512 + 4
-> 3x = 156
-> x = 156 : 3
-> x = 52
Vậy x = 52