Question

(-x+5).(3-x)=0

Answer 1

\(\left(-x+5\right)\left(3-x\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}-5+x=0\\3-x=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=3\end{matrix}\right.\)

Answer 2

⇔[−5+x=03−x=0⇔[−5+x=03−x=0

⇔[x=5x=3

Answer 3

\((x+5)(3-x) \)

⇔ \(\left[\begin{array}{} -x+5=0\\ 3-x=0 \end{array} \right.\) ⇔ \(\left[\begin{array}{} x=5\\ x=3 \end{array} \right.\)

 

Answer 4

Vẽ hai góc kề bù xoy và yox có xoy = 120 độ tính yox =?