1.把下列根式化为最简二次根式(式中a>b>0)根号下b/a+a/b-2(根号我不知点打啊)2.在实数范围内分解因式①+根号2×x-4 ②3x^2-5x-8③a^4+b^4(看的明白吧!x^2既是x的平方)

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