展开全部
1.先把符号提取出来 第二项等于 (1/2)^(-2/3) (因为是先平方 再开方 所以负号消去)
最后得到 - (1/2)^(1/2) * (1/2)^(-2/3) * (1/2)^(-1/3) = - (1/2)^(1/2 -2/3 -1/3) = -(1/2)^(-1/2)
= - 根号2
2. 原式= 3^1/2 * 3^(2*1/3) / 3^(1/6) = 3^(1/2 + 2/3 - 1/6) =3^1 =3
3. a =? 不给没办法算
4. = 1/2 * 4√3 - 1/4 * 15/(2√3) = √3 * (2 -5/8) = 11√3/8
5. = 1 + (√5-2)/3 - √5 = (1-2√5)/3
最后得到 - (1/2)^(1/2) * (1/2)^(-2/3) * (1/2)^(-1/3) = - (1/2)^(1/2 -2/3 -1/3) = -(1/2)^(-1/2)
= - 根号2
2. 原式= 3^1/2 * 3^(2*1/3) / 3^(1/6) = 3^(1/2 + 2/3 - 1/6) =3^1 =3
3. a =? 不给没办法算
4. = 1/2 * 4√3 - 1/4 * 15/(2√3) = √3 * (2 -5/8) = 11√3/8
5. = 1 + (√5-2)/3 - √5 = (1-2√5)/3
追问
谢了,你只需做第一题就可以了,别的我会了
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