9.
给出下面两个推理\((\)其中\({Q}\)为有理数集,\(\mathbf{R}\)为实数集,\({C}\)为复数集\()\):
\(①\)由“若\(a,b\in \mathbf{R}\),\(a-b=0\),则\(a=b\)”推出“\(a,b\in {C}\) ,\(a-b=0\),则\(a=b\)”
\(②\)由“若\(a,b,c,d\in {R}\),复数\(a+bi=c+di\),则\(a=c,b=d\)”推出“若\(a,b,c,d\in {Q}\),\(a+b\sqrt{2}{=}c+d\sqrt{2}\),则\(a=c,b=d\)”\(.\)
其中推理正确的是