Toán Lớp 6: tìm x
a, ( 2600 + 6400 ) – 3x =1200 b, [ (6x – 39) : 7 ] .4 = 12
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Toán Lớp 6: tìm x
a, ( 2600 + 6400 ) – 3x =1200 b, [ (6x – 39) : 7 ] .4 = 12
Comments ( 2 )
$⇒3x=9000-1200$
$⇒3x=7800$
$⇒x=7800:3$
$⇒x=2600$
Vậy $x=2600$
$⇒(6x-39):7=12:4$
$⇒(6x-39):7=3$
$⇒6x-39=3.7$
$⇒6x-39=21$
$⇒6x=21+39$
$⇒6x=60$
$⇒x=10$