Question

[Đỗ Thành Long]

Giải giúp với

Answer 1

[Yen Nhi]

a) \(\left(x-5\right):7=0\)

\(\Rightarrow x-5=0\)

\(\Rightarrow x=5\)

b) \(\left(x-5\right):3+3=24\)

\(\Rightarrow\left(x-5\right):3=21\)

\(\Rightarrow x-5=63\)

\(\Rightarrow x=68\)

c) \(\left(45-9x\right)\left(x.5-15\right)=0\)

\(\Rightarrow\orbr{\begin{cases}45-9x=0\\x.5-15=0\end{cases}}\Rightarrow\orbr{\begin{cases}9x=45\\x.5=15\end{cases}}\Rightarrow\orbr{\begin{cases}x=5\\x=3\end{cases}}\)

d) \(3\left(x-7\right)-2=100\)

\(\Rightarrow3\left(x-7\right)=102\)

\(\Rightarrow x-7=34\)

\(\Rightarrow x=41\)