TH1 : \(x\) chia het cho \(5\)\(\Rightarrow\)\(x=234\times5=1170\)
TH2 : \(x\)chia \(5\)du \(1\) \(\Rightarrow\)\(234\times5+1=1171\)
TH3 : \(x\)chia \(5\)du \(2\)\(\Rightarrow\)\(234\times5+2=1172\)
TH4 : \(x\)chia \(5\)du \(3\)\(\Rightarrow\)\(234\times5+4=1174\)
KL ; \(x\)thuoc .....
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