
计算下面各题.89-16+23 7-...
1个回答
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(1)
-
+
=
+
=
;
(2)7-
-
=7-(
+
)
=7-
=5
(3)
+
+
+
=(
+
)+(
+
)
=
+1
=1
.
8 |
9 |
1 |
6 |
2 |
3 |
=
13 |
18 |
2 |
3 |
=
25 |
18 |
(2)7-
5 |
8 |
3 |
4 |
=7-(
5 |
8 |
3 |
4 |
=7-
11 |
8 |
=5
5 |
8 |
(3)
4 |
11 |
2 |
7 |
6 |
11 |
5 |
7 |
=(
4 |
11 |
6 |
11 |
2 |
7 |
5 |
7 |
=
10 |
11 |
=1
10 |
11 |
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