问题 解答题
计算,能简便的用简便方法计算:
8
17
-
7
15
+
26
17
-
8
15

5
6
-(
7
15
-
5
12

5-
1
7
-
3
7
-
10
7

2
3
-(10-6)÷8.
答案

8
17
-
7
15
+
26
17
-
8
15

=(

8
17
+
26
17
)-(
7
15
+
8
15
),

=2-1,

=1;

5
6
-(
7
15
-
5
12

=

5
6
-
1
20

=

47
60

5-

1
7
-
3
7
-
10
7

=5-(

1
7
+
3
7
+
10
7
),

=5-2,

=3;

2
3
-(10-6)÷8,

=

2
3
-4÷8,

=

2
3
-
1
2

=

1
6

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