Question

tìm x biết :

a. (x - 5 . 4 )=0

b. 6x +4x =201

c. (x -4 ). (x -3 =0

Answer 1

a) \(\left(x-5.4\right)=0\)

\(\Leftrightarrow x-20=0\)

\(\Leftrightarrow x=0+20\)

\(\Leftrightarrow x=20\)

b) \(6x+4x=201\)

\(\Leftrightarrow10x=201\)

\(\Leftrightarrow x=201:10\)

\(\Leftrightarrow x=20,1\)

c) \(\left(x-4\right)\left(x-3\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-4=0\\x-3=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=0+4\\x=0+3\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=4\\x=3\end{cases}}\)

Answer 2

a/x bang 0                                               c/x bang 0                  

         cau b hinh nhu sai de roi

Answer 3

mk viet nham

a/x=20

c/ x=4 hoac 3