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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