问题 填空题
(2-
5
)1001•(2+
5
)1000
=______;②
(-0.3)2
=______;③
(2-
3
)
2
=______.
答案

(2-

5
)1001•(2+
5
)1000=[(2-
5
)(2+
5
)]1000•(2-
5

=(-1)1000•(2-

5

=2-

5

(-0.3)2
=0.3;

(2-
3
)
2
=2-
3

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