Question

a, 12 - /x - 8/= 3       b,15 -(x + 18)=-24

Answer 1

a.

12-lx-8l=3

lx-8l=12-3=9

\(\hept{\begin{cases}x-8=9\\x-8=-9\end{cases}}\)

Answer 2

b.

15-(x+18)=24

x+18=15-24

x+18=-9

x=-9-18

x=-27

Answer 3

a, 12 - |x - 8| = 3

|x - 8| = 12 - 3

|x - 8| = 9

=> x - 8 = 9

hoặc x - 8 = -9

Nếu x - 8 = 9 => x = 9 + 8 = 17

Nếu x - 8 = -9 => x = (-9) + 8 = -1

b, 15 - (x + 18) = -24

x + 18 = 15 - (-24)

x + 18 = 39

x = 39 - 18

x = 21