Tìm số nguyên x, biết:
a) x – 12 = (-9) – 15
b) x – (17 – x) = x – 7
c) 2 = |x +3| = 10
Tìm số nguyên x, biết: a) x – 12 = (-9) – 15 b) x – (17 – x) = x – 7 c) 2 = |x +3| = 10
By Abigail
By Abigail
Tìm số nguyên x, biết:
a) x – 12 = (-9) – 15
b) x – (17 – x) = x – 7
c) 2 = |x +3| = 10
Bạn tự kết luộn nhé !!!
`a)x-12=(-9)-15`
`⇒x-12=-24`
`⇒x=-24+12`
`⇒x=-12`
`b) x – (17 – x) = x – 7`
`⇒x-17+x=x-7`
`⇒x+x-x=-7+17`
`⇒x=10`
`c)2 + |x +3| = 10`
`⇒|x+3|=10-2`
`⇒|x+3|=8`
`⇒`\(\left[ \begin{array}{l}x+3=8\\x+3=-8\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=5\\x=-11\end{array} \right.\)
$#DYHUN$
`a)x-12=(-9)-15`
`⇒x=12-9-15=-12`
`b)x-(17-x)=x-7`
`⇒x-17+x=x-7`
`⇒x+x-x=17-7`
`⇒x=10`
`2+|x+3|=10`
`⇒|x+3|=10-2=8`
`1)x+3=8⇒x=5`
`2)x+3=-8⇒x=-11`