问题 解答题
计算.(能简算的要简算)
61
3
4
-15.37+38
1
4
-34.63

24×(
3
8
+
5
6
-
3
4
360÷[56×(
3
7
-
3
8
)]
6
13
×1.7+
7
13
×1.7)÷
7
10
80.7×8.7+8.07×13
8
9
×[
3
5
-(
9
16
-
2
5
)]
答案

(1)61

3
4
-15.37+38
1
4
-34.63,

=(61

3
4
+38
1
4
)-(15.37+34.63),

=100-50,

=50;

(2)24×(

3
8
+
5
6
-
3
4
),

=24×

3
8
+24×
5
6
-24×
3
4

=9+20-18,

=11;

(3)360÷[56×(

3
7
-
3
8
)],

=360÷[56×

3
7
-56×
3
8
],

=360÷[24-21],

=360÷3,

=120;

(4)(

6
13
×1.7+
7
13
×1.7)÷
7
10

=(

6
13
+
7
13
)×1.7×
10
7

=1×

17
10
×
10
7

=

17
7

(5)80.7×8.7+8.07×13,

=8.07×87+8.07×13,

=8.07×(87+13),

=8.07×100,

=807;

(6)

8
9
×[
3
5
-(
9
16
-
2
5
)],

=

8
9
×[
3
5
-
9
16
+
2
5
],

=

8
9
×[1-
9
16
],

=

8
9
×
7
16

=

7
18

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