Question

Tìm x biết

a,(x-37).25=0

b,(x-42).(x-21)=0

Answer 1

a x-37=0

x=37

b x-42=0 hoặc x-21=0

x=42,21

Answer 2

\(a.\left(x-37\right).25=0\\\Leftrightarrow x-27=0\\ \Leftrightarrow x=27\)

\(b.\left(x-42\right)\left(x-21\right)=0\\ \Leftrightarrow\orbr{\begin{cases}x-42=0\\x-21=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=42\\x=21\end{cases}}}\)

Answer 3

a, x=37

b, \(\orbr{\begin{cases}x=42\\x=21\end{cases}}\)