题目内容

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
)
(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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