Question

𝚝ì𝚖 𝚡 ∈ 𝙽 𝚜𝚊𝚘 𝚌𝚑𝚘:

𝚊) 𝚡 + 𝟼 𝚌𝚑𝚒𝚊 𝚑ế𝚝 𝚌𝚑𝚘 𝚡

𝚋) 𝚡+ 𝟿 𝚌𝚑𝚒𝚊 𝚑ế𝚝 𝚌𝚑𝚘 𝚡+𝟷

𝚌) 𝟸𝚡 + 𝟷 𝚌𝚑𝚒𝚊 𝚑ế𝚝 𝚌𝚑𝚘 𝚡 - 𝟷

Answer 1

a: =>6 chia hết cho x

=>\(x\in\left\{1;2;3;6\right\}\)

b: =>x+1+8 chia hết cho x+1

=>\(x+1\in\left\{1;2;4;8\right\}\)

hay \(x\in\left\{0;1;3;7\right\}\)

c: =>2x-2+3 chia hết cho x-1

=>\(x-1\in\left\{-1;1;3\right\}\)

hay \(x\in\left\{0;2;4\right\}\)