Question

1+1+2+...+144+233+377

Answer 1

\(-x\left(8-x\right)=0\Rightarrow\orbr{\begin{cases}-x=0\\8-x=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=0\\x=8\end{cases}}\)

Answer 2

-x.(8-x)=0

Xét 2 trường hợp:

Nếu -x=0 \(\Rightarrow\)x=0

Nếu 8-x=0 \(\Rightarrow\)x=8

Vậy x=0 hoặc x=8

Answer 3

-x . (8 - x) =0

=> (-x) . [ 8 + (-x) ] = 0

=>(- 8x) + x² =0

=>\(\hept{\begin{cases}-8x=0\\x^2=0\end{cases}}\)

=> x=0

vậy...