题目内容
计算:
(1)(
+
)×2
(2)(4
-3
)÷2
(3)(2
+3)(2
-2)
(4)(
+
)2
(5)(2
-3
)2
(6)(3
+2
)(3
-2
).
(1)(
| 12 |
| 18 |
| 6 |
(2)(4
| 15 |
| 5 |
| 5 |
(3)(2
| 5 |
| 5 |
(4)(
| 6 |
| 3 |
(5)(2
| 6 |
| 2 |
(6)(3
| 3 |
| 2 |
| 3 |
| 2 |
(1)原式=(2
+3
)×2
=2
×2
+3
×2
=12
+12
;
(2)原式=4
÷2
-3
÷2
=2
-
;
(3)原式=(2
)2-4
+6
-6
=20-4
+6
-6
=14+2
;
(4)原式=6+2
×
+3
=9+6
;
(5)原式=24-2×2
×3
+18
=42-24
;
(6)原式=(3
)2-(2
)2
=27-8
=19.
| 3 |
| 2 |
| 6 |
=2
| 3 |
| 6 |
| 2 |
| 6 |
=12
| 2 |
| 3 |
(2)原式=4
| 15 |
| 5 |
| 5 |
| 5 |
=2
| 3 |
| 3 |
| 2 |
(3)原式=(2
| 5 |
| 5 |
| 5 |
=20-4
| 5 |
| 5 |
=14+2
| 5 |
(4)原式=6+2
| 6 |
| 3 |
=9+6
| 2 |
(5)原式=24-2×2
| 6 |
| 2 |
=42-24
| 3 |
(6)原式=(3
| 3 |
| 2 |
=27-8
=19.
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