题目内容
计算
(1)
;
(2)(2+
)(2-
);
(3)(
-
)2;
(4)
;
(5)
.
(1)
| ||||
|
(2)(2+
| 3 |
| 3 |
(3)(
| 5 |
| 2 | ||
|
(4)
| 1452-242 |
(5)
| (-64)×(-81) |
(1)原式=
=
;
(2)原式=22-3=1;
(3)原式=(
)2+(
)2-2×
×
=5+
-4
=
;
(4)原式=
=
=11×13
=143;
(5)原式=
=
×
=8×9
=72.
2
| ||
2
|
| 3 |
(2)原式=22-3=1;
(3)原式=(
| 5 |
| 2 | ||
|
| 5 |
| 2 | ||
|
=5+
| 4 |
| 5 |
=
| 9 |
| 5 |
(4)原式=
| (145-24)(145+24) |
=
| 121×169 |
=11×13
=143;
(5)原式=
| 64×81 |
=
| 64 |
| 81 |
=8×9
=72.
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