问题 解答题
计算:
(1)
1
3
×
75

(2)(
5
+
2
2-
5
5
+
2
);
(3)
6-
54
6
-
24
答案

(1)

1
3
×
75
=
1
3
×75
=
25
=5;

(2)(

5
+
2
2-
5
5
+
2
),

=5+2

5
×
2
+2-5-
5
×
2

=

10
+2;

或(

5
+
2
2-
5
5
+
2
),

=(

5
+
2
)(
5
+
2
-
5
),

=

2
5
+
2
),

=

10
+2;

(3)

6-
54
6
-
24

=

6
-
9
-2
6

=-3-

6

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