问题 解答题
计算:
(1)
3
-
18
+2
12

(2)(
1
2
-
3
3
24

(3)(3+
6
)(3
2
-2
3
)

(4)2abc
c3
2a4b
(字母均大于0);
(5)
0.01×81
0.25×144

(6)(
3
-1)2+(2+
3
)(2-
3
)
答案

(1)

3
-
18
+2
12

=

3
-3
2
+4
3

=5

3
-3
2

(2)(

1
2
-
3
3
24

=

1
2
×24
-
3
3
×
24

=2

3
-2
2

(3)(3+

6
)(3
2
-2
3
)

=9

2
-6
3
+6
3
-6
2

=3

2

(4)2abc

c3
2a4b

=2abc•

c
2bc
2a2b

=

c2
a
2bc

(5)

0.01×81
0.25×144

=

0.1×9
0.5×12

=

3
20

(6)(

3
-1)2+(2+
3
)(2-
3
)

=3+1-2

3
+4-3

=5-2

3

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