Toán Lớp 6: 205+5(39-x)=300 giúp em với ạ đang cần gấp
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Toán Lớp 6: 205+5(39-x)=300 giúp em với ạ đang cần gấp
Comments ( 2 )
205+5(39-x)=300
5(39-x)=95
39-x=19
x=20
Vậy x=20
$205+5\left(39-x\right)=300$
$⇒205+5\left(39-x\right)-205=300-205$
$⇒5\left(39-x\right)=95$
$⇒\dfrac{5\left(39-x\right)}{5}=\dfrac{95}{5}$
$⇒39-x=19$
$⇒39-x-39=19-39$
$⇒-x=-20$
$⇒\dfrac{-x}{-1}=\dfrac{-20}{-1}$
$⇒x=20$
Vậy $x=20$