问题 解答题
脱式计算,能简算的要简算.
5
6
-(
2
3
-
1
9
1
2
+
4
5
-
3
10
32-
7
15
-
8
15
9
10
-
3
4
+
1
10
-
1
4
答案

(1)

5
6
-(
2
3
-
1
9
),

=

5
6
-
5
9

=

5
18

(2)

1
2
+
4
5
-
3
10

=

13
10
-
3
10

=1;

(3)32-

7
15
-
8
15

=32-(

7
15
+
8
15
),

=32-1,

=31;

(4)

9
10
-
3
4
+
1
10
-
1
4

=(

9
10
+
1
10
)-(
3
4
+
1
4
),

=1-1,

=0.

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