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1个回答
展开全部
(1)
+
?
=
+
-
=
;
(2)
-(
-
)
=
+
-
=
-
=
.
2 |
5 |
1 |
2 |
3 |
4 |
=
8 |
20 |
10 |
20 |
15 |
20 |
=
3 |
20 |
(2)
1 |
4 |
2 |
5 |
1 |
4 |
=
1 |
4 |
1 |
4 |
2 |
5 |
=
1 |
2 |
2 |
5 |
=
1 |
10 |
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