Question

TÌM SỐ NGUYÊN X:

(x+5)+9-x=x+2

x+5+9-x=x+2

x+5+x-9=x+2

trả lời gấp cho mik nha.Thanks

love y....

Answer 1

a) \(\left(x+5\right)+9-x=x+2\)

\(\Leftrightarrow\left(x+5\right)+9-x-\left(x+2\right)=0\)

\(\Leftrightarrow x+5+9-x-x-2=0\)

\(\Leftrightarrow12-x=0\)

\(\Leftrightarrow x=12-0\)

\(\Leftrightarrow x=12\)

Vậy x=12

b) \(x+5+9-x=x+2\)

\(\Leftrightarrow x+5+9-x-\left(x+2\right)=0\)

\(\Leftrightarrow x+5+9-x-x-2=0\)

\(\Leftrightarrow12-x=0\)

\(\Leftrightarrow x=12-0\)

\(\Leftrightarrow x=12\)

Vậy x=12

c) \(x+5+x-9=x+2\)

\(\Leftrightarrow x+5+x-9-\left(x+2\right)=0\)

\(\Leftrightarrow x+5+x-9-x-2=0\)

\(\Leftrightarrow x-6=0\)

\(\Leftrightarrow x=6+0\)

\(\Leftrightarrow x=6\)

Vậy x=6