题目内容
计算:
①(3
-2
)(3
+2
);
②|
|-(
-
)0×
;
③
÷
;
④
+
+
+…+
.
①(3
| 2 |
| 3 |
| 2 |
| 3 |
②|
| 3 | -8 |
| ||
| 3 |
| 6 |
| (-2)4 |
③
| -a3 |
|
④
| 2 | ||
1+
|
| 2 | ||||
|
| 2 | ||||
|
| 2 | ||||
|
①原式=(3
)2-(2
)2=18-12=6;
②原式=|-2|-1×
=2-1×4=-2;
③由题可知a<0,
∴原式=
÷
=
×
×
=|a|×
×
=
;
④原式=2(
-1+
-
+
-
+…+
-
)
=2(
-1)
=2×9
=18.
| 2 |
| 3 |
②原式=|-2|-1×
| 24 |
③由题可知a<0,
∴原式=
| a2×(-a) |
| 2 | ||
|
=
| a2 |
| -a |
| ||
| 2 |
=|a|×
| -a |
| |a| |
| 2 |
=
| a2 |
| 2 |
| -a |
④原式=2(
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 100 |
| 99 |
=2(
| 100 |
=2×9
=18.
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