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\((\)Ⅱ\()\)已知\(a\geqslant b\),求证:\(\sqrt{2a-b}+\sqrt{{{a}^{2}}-b}\geqslant a\).
已知\(x > 0\),\(y > 0\),且\(x+y+xy=3\),则\(x+y\)的最小值为__________.
\(\Delta ABC\)各角的对应边分别为\(a\),\(b\),\(c\),满足\(\dfrac{b}{a+c}+\dfrac{c}{a+b}\geqslant 1\),则角\(A\)的范围是 .
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