问题 填空题
计算:(1)(2
3
+
2
)(2
3
-
2
)=______;
(2)3
48
-2
75
=______;
(3)
a3
÷
a
b
a
b
1
a
=______.
答案

(1)(2

3
+
2
)(2
3
-
2
)=12-2=10;

(2)3

48
-2
75
=12
3
-10
3
=2
3

(3)

a3
÷
a
b
a
b
1
a
=a
a
b
a
a
b
1
a
=a.

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