Question

Tìm x biết

a. x+5=|-18|

b. |-35|-x=|-5|

c. 25-|x|=10

d. |x-2|+7=12

Answer 1

a,\(x+5=\left|-18\right|\)

\(x+5=18\)

\(x=13\)

b,\(\left|-35\right|-x=\left|-5\right|\)

\(35-x=5\)

\(x=30\)

c,\(25-\left|x\right|=10\)

\(\left|x\right|=15\)

\(\Leftrightarrow\left[{}\begin{matrix}x=15\\x=-15\end{matrix}\right.\)

Vậy x=15 hoặc x=-15.

d,\(\left|x-2\right|+7=12\)

\(\left|x-2\right|=5\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=5\\x-2=-5\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-3\end{matrix}\right.\)

Vậy...

Answer 2

A.x+5=18

x=18-5

x=13

B.35-x=5

x=35-5

x=30

C,25-x=10

x=25-10

x=15

D.x=7

x-2=5