试题

题目:
已知:
5.21
=2.283,
52.1
=7.281,
35.21
=1.734,
352.1
=3.735,则
5210
=
72.81
72.81
30.0521
=
0.3735
0.3735

答案
72.81

0.3735

解:∵
52.1
=7.281,
5210
=
52.1
×
100
=7.281×10=72.81;
352.1
=3.735,
30.0521
=
3
52.1
1000
=
352.1
10
=
3.735
10
=0.3735.
故答案为:72.81;0.3735.
考点梳理
立方根;算术平方根.
先把
5210
化为
52.1
×
100
的形式,
30.0521
化为
3
52.1
1000
=
352.1
10
的形式,再把已知条件代入求解即可.
本题考查的是立方根及算术平方根,根据题意把所求式子分解为已知条件的形式是解答此题的关键.
探究型.
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