Rút gọn biểu thức : a, A=√3+√5+2√3 . √3-√5+2√3 b, B=√4+√8 . √2+√2+√2 . √2-√2+√2 c, C=(4+√15) . (√10-√6) . √4-√15 d, D=√2+√3 . √2+√2+√3 . √2+√2+√2+√3 . √2-√2+√2+√3

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