Tìm x biết:
a) x-96 = (443 – x) – 15
c) 353 – x = 46+(3x-21)
e) -2.(x+6)-6.(x-10)=8
g) (-2x) . (-4x)+28= 100
Cảm ơn trước ah! ^^*
Tìm x biết: a) x-96 = (443 – x) – 15 c) 353 – x = 46+(3x-21) e) -2.(x+6)-6.(x-10)=8 g) (-2x) . (-4x)+28= 100 Cảm ơn trước ah! ^^*
By Natalia
Đáp án:
a) x-96 = (443 – x) – 15
x-96 = 443-x -15
2x = 524
x = 262
c) 353 – x = 46+(3x-21)
353-x = 46+3x-21
4x = 353-46+21
4x = 353
x = 82
e) -2.(x+6)-6.(x-10) = 8
-2x-12-6x = 60 = 8
-8x=-40
x = 5
g) (-2x) . (-4x)+28 = 100
8x² = 72
x²=9
\(\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.\)
xong
a,$x-96=(443-x)-15$
$⇒x-96=443-x-15$
$⇒2x=524$
$⇒x=262$
c,$353-x=46+(3x-21)$
$⇒353-x=46+3x-21$
$⇒4x=353-46+21$
$⇒4x=328$
$⇒x=82$
e,$-2.(x+6)-6.(x-10)=8$
$⇒-2x-12-6x+60=8$
$⇒-8x=-40$
$⇒x=5$
g,$(-2x).(-4x)+28=100$
$⇒8x²=72$
$⇒x²=9$
⇒\(\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.\)