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第3冊單元2-1平方根與近似值

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Q 1/20
Score 0
下列敘述何者正確？
29
$0.2$ 為 $0.4$ 的平方根
$\sqrt{81}$ 的平方根為 $9$
$0.12$ 為 $1.44$ 的平方根
$-3$ 是 $9$ 的平方根

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20 questions

Show answers

Q1
下列敘述何者正確？
$0.2$ 為 $0.4$ 的平方根
$\sqrt{81}$ 的平方根為 $9$
$0.12$ 為 $1.44$ 的平方根
$-3$ 是 $9$ 的平方根
30s
Q2
60s
Q3
下列各式中何者正確？
$-\sqrt{8.1}=-0.9$
$\sqrt{(-17)^2}=17$
$\sqrt{64}=\pm 8$
$\sqrt{3^2+4^2}=7^2$
60s
Q4
下列敘述何者正確？
$3$ 的兩個平方根中，有一個為 $-\sqrt{3}$
$\sqrt{3}$ 的平方根為 $9$
若 $x^2=3$ ，則 $x=\sqrt{3}$
$-\sqrt{3}$ 為 $-3$ 的平方根
60s
Q5
120s
Q6
60s
Q7
120s
Q8
60s
Q9
120s
Q10
60s
Q11
60s
Q12
120s
Q13
300s
Q14
120s
Q15
下列敘述何者錯誤？
$\sqrt{(-2)^2}=-2$
$\sqrt{2^2}=2$
$(\sqrt{(-2)^2})^2=4$
$-\sqrt{2^2}=-2$
120s

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