Evaluate(評估)the following:
(a) 49^1/2
(b) 8^-1/3
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2009-04-04 8:35 am
回答 (2)
2009-04-04 8:54 am
✔ 最佳答案
(a)49^1/2
= (7^2)^1/2
= 7
( For - 49^1/2 = - 7 )
(b)
8^-1/3
= (2^3)^-1/3
= 2^-1
= 1/2
2009-04-04 8:40 am
49^(1/2)
= sq. root of 49
=7 or -7
Since 7 x 7 = 49 and (-7) x (-7) =49
b)
8^(-1/3)
=8^(0-1/3)
=8^0/8^(1/2)
=1/2//
= sq. root of 49
=7 or -7
Since 7 x 7 = 49 and (-7) x (-7) =49
b)
8^(-1/3)
=8^(0-1/3)
=8^0/8^(1/2)
=1/2//
收錄日期: 2021-04-13 16:32:54
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