a) 42 : x + 36 : x = 6
x = ( 42 + 36 ) : x = 6
x = 78 : x = 6
x = 78 : 6
x = 13
b) 90 : x - 48 : x = 3
x = (90 - 48 ) : x = 3
x = 42 : x = 3
x = 42 : 3
x = 14
cho mình một tim nhé
a) 42 : x + 36 : x = 6
( 42 + 36 ) : x = 6
78 : x = 6
x = 78 : 6 = 13
b) 90 : x - 48 : x = 3
( 90 - 48 ) : x = 3
42 : x = 3
x = 42 : 3 = 14
~~~ HT ~~~