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www.jxg213.coma = 15/b 代入 a^2+2b^2 = 59,
225/b^2 + 2b^2 = 59
2b^4 - 59b^2 + 225 = 0
b^2 = [59±√(59^2-8×225)]/4 = [59±41]/4 = 25 或 9/2
b = 5, a = 3 或 b = -5, a = -3,
或 b = 3√2/2 , a = 5√2 或 b = -3√2/2 , a = -5√2
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=√(42×2)-3√(2/22)+(1/2)√2-3√(22×2)
=4√2-(3/2)√2+(1/2)√2-3×2√2
=(4-3/2+1/2-6)√2
=-3√2