Question

Tìm x :

( x + 9) + ( x - 8 ) + ( x + 7) + ( x - 6 ) + ( x + 5) + ( x - 4 ) = 63,6

giúp nhé !

Answer 1

\(\left(x+9\right)+\left(x-8\right)+\left(x+7\right)+\left(x-6\right)+\left(x+5\right)+\left(x-4\right)=63,6\)

\(\Leftrightarrow x+9+x-8+x+7+x-6+x+5+x-4=63,6\)

\(\Leftrightarrow x\times6+3=63,6\)

\(x\times6=63,6-3\)

\(x\times6=60,6\)

\(x=60,6:6\)

\(x=10,1\)

Answer 2

Ta có :

\(\left(x+9\right)+\left(x-8\right)+\left(x+7\right)+\left(x-6\right)+\left(x+5\right)+\left(x-4\right)=63,6\)\(x+9+x-8+x+7+x-6+x+5+x-4=63,6\)\(6x+3=63,6\)

\(6x=60,6\)

\(x=10,1\)