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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