a) 45 - 3x = 15
3x = 30
x = 10
b) 4x - 20 = 32
4x = 52
x = 13
c) 2x : 16 = 14
2x = 224
x = 112
d) 0 : 5x = 0
=> x thuộc Z
e) 3240 : 9x = 18
9x = 180
x = 20
a,45-3x=15
-3x=-30
x=10
b,4x-20=32
4x=52
x=13
c,2x:16=14
2x=224
x=112
d,0:5x=0
5x=0
x=0
e,3240:9x=18
9x=180
x=20
=.= hok tốt!!
\(45-3x=15\Leftrightarrow3x=30\Leftrightarrow x=10\)
\(4x-20=32\Leftrightarrow4x=52\Leftrightarrow x=13\)
\(2x:16=14\Leftrightarrow2x=224\Leftrightarrow x=112\)
\(0:5x=0\Leftrightarrow5x=0\Leftrightarrow x=0\)
\(3240:9x=18\Leftrightarrow9x=180\Leftrightarrow x=20\)