B
buipin23


1. [TEX]\sqrt{x^2-5x+8}+\sqrt{2x^2-10x+9}=3[/TEX]
2.[TEX]\sqrt{x^2-5x+7}+\sqrt{x^2+7x-14}\leq3[/TEX]
2.[TEX]\sqrt{x^2-5x+7}+\sqrt{x^2+7x-14}\leq3[/TEX]
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