问题 填空题
我们已经知道
3
×
3
=
3×3
=
32
=3
,显然把上面的步骤反过来写3=
32
=
3×3
=
3
×
3
也成立,运用这种方法可将一些根式化简,如:
(1)
18
=______;(2)3
3
-
75
=______;(3)
2
7
=______.(4)
7-
7
7
=______.
答案

(1)

18
=
2×9
=3
2

(2)3

3
-
75
=3
3
-5
3
=-2
3

(3)

2
7
=
2
7
=
2×7
7
=
14
7

(4)

7-
7
7
=
7
7
-7
7
=
7
-1.

单项选择题 A1/A2型题
单项选择题 A1/A2型题