题目内容
计算:
(1)
-
+2
;
(2)(
-
)×
;
(3)(3+
)(3
-2
);
(4)2abc
(字母均大于0);
(5)
;
(6)(
-1)2+(2+
)(2-
).
(1)
3 |
18 |
12 |
(2)(
|
| ||
3 |
24 |
(3)(3+
6 |
2 |
3 |
(4)2abc
|
(5)
|
(6)(
3 |
3 |
3 |
(1)
-
+2
=
-3
+4
=5
-3
.
(2)(
-
)×
=
-
×
=2
-2
.
(3)(3+
)(3
-2
)
=9
-6
+6
-6
=3
.
(4)2abc
=2abc•
=
.
(5)
=
=
.
(6)(
-1)2+(2+
)(2-
)
=3+1-2
+4-3
=5-2
.
3 |
18 |
12 |
=
3 |
2 |
3 |
=5
3 |
2 |
(2)(
|
| ||
3 |
24 |
=
|
| ||
3 |
24 |
=2
3 |
2 |
(3)(3+
6 |
2 |
3 |
=9
2 |
3 |
3 |
2 |
=3
2 |
(4)2abc
|
=2abc•
c
| ||
2a2b |
=
c2 |
a |
2bc |
(5)
|
=
0.1×9 |
0.5×12 |
=
3 |
20 |
(6)(
3 |
3 |
3 |
=3+1-2
3 |
=5-2
3 |
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