Ta có: 7200 : [ 200 + ( 33600 : x ) - 500 ] = 4
[ 200 + ( 33600 : x ) - 500 ] = 1800
200 + ( 33600 : x ) = 2300
33600 : x = 2100
x = 16
7200 : [ 200 + ( 33600 : x ) - 500 ] = 4
[ 200 + ( 33600 : x ) - 500 ] = 7200 : 4
[ 200 + ( 33600 : x ) - 500 ] = 1800
( 33600 : x ) - 500 = 1800 - 200
( 33600 : x ) - 500 = 1600
33600 : x = 1600 + 500
33600 : x = 2100
x = 33600 : 2100
x = 16
hok tốt
7200 : [ 200 + ( 33600 : x ) - 500 ] = 4
200 + ( 33600 : x ) - 500 =7200 : 4
200 + ( 33600 : x ) - 500 =1800
200 + ( 33600 : x ) =1800+500
200 + ( 33600 : x ) =2300
33600 : x =2300-200
33600 : x =2100
x = 33600 :2100
x =16
\(7200:\left[200+\left(33600:x\right)-500\right]=4\)
\(\Leftrightarrow\left(33600:x\right)-300=1800\)
\(\Leftrightarrow33600:x=2100\)
\(\Leftrightarrow x=16\)
P/s tham khảo nha