题目内容
(1)3
+2
-
(2)9
-7
+5
(3)(
+
)(
-
)
(4)
×(
-3
)
| 8 |
| 32 |
| 50 |
(2)9
| 3 |
| 12 |
| 48 |
(3)(
| 2 |
| 5 |
| 2 |
| 5 |
(4)
| 3 |
| 48 |
| 25 |
(1)原式=6
+8
-5
=9
;
(2)原式=9
-14
+20
=15
;
(3)原式=(
)2-(
) 2=2-5=-3;
(4)原式=
×
-
×3
=48-15
.
| 2 |
| 2 |
| 2 |
| 2 |
(2)原式=9
| 3 |
| 3 |
| 3 |
| 3 |
(3)原式=(
| 2 |
| 5 |
(4)原式=
| 3 |
| 48 |
| 3 |
| 25 |
| 3 |
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