二次根式混合运算:
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(1)√48 ÷ √3 - √(1 / 2)× √12 + √24
= √(48 ÷ 3) - √(12 × 1 / 2) + √(2 ² × 6)
= √16 - √6 + 2√6
= √4² + √6
= 4 + √6
(2)解:2(a + √3)(a - √3)- a(a - 6)+ 6
= 2 【 a ² - (√3)² 】 - a ² + 6 a + 6
= 2 a ² - 3 × 2 - a ² + 6 a + 6
= a ² - 6 + 6 a + 6
= a ² + 6 a
当 a = √2 - 1 时,原式 = a ² + 6 a
= (√2 - 1)² + 6(√2 - 1)
= (√2)² - 2√2 + 1 + 6√2 - 6
= 2 - 2√2 + 1 + 6√2 - 6
= 4√2 - 3
= √(48 ÷ 3) - √(12 × 1 / 2) + √(2 ² × 6)
= √16 - √6 + 2√6
= √4² + √6
= 4 + √6
(2)解:2(a + √3)(a - √3)- a(a - 6)+ 6
= 2 【 a ² - (√3)² 】 - a ² + 6 a + 6
= 2 a ² - 3 × 2 - a ² + 6 a + 6
= a ² - 6 + 6 a + 6
= a ² + 6 a
当 a = √2 - 1 时,原式 = a ² + 6 a
= (√2 - 1)² + 6(√2 - 1)
= (√2)² - 2√2 + 1 + 6√2 - 6
= 2 - 2√2 + 1 + 6√2 - 6
= 4√2 - 3
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