Toán Lớp 6: 119-3.(7x – 4) = 47
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Toán Lớp 6: 119-3.(7x – 4) = 47
Các bạn giúp mình nha
Comments ( 2 )
119-3.(7x-4)=47
3.(7x-4)=119-47
3.(7x-4)=72
7x-4=72:3
7x-4=24
7x=24+4
7x=28
x=28:7
x=4
_________chúc bạn học tốt_________
$119-3.(7x-4)=47$
$⇒ 119-21x+12=47$
$⇒ 131-21x=47$
$⇒ 21x=131-47$
$⇒ 21x=84$
$⇒ x=84:21$
$⇒ x=84:21$
$⇒ x=4$
Vậy $x=4$
$#thanhmaii2008$