问题 解答题
(1)
12
-
3
3
-
8
2

(2)(2
2
+
7
)(2
2
-
7
)+(3
2
-5)2
答案

(1)原式=2

3
-
3
-
2

=

3
-
2

(2)原式=(2

2
2-(
7
2+(3
2
2-30
2
+25

=8-7+18-30

2
+25

=44-30

2

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