问题 解答题
57.26-(5.26-1.5)64×1.25×2.5
4
9
+
2
15
)÷
2
15
4.8×3.9+6.1×4
4
5
12×(
1
6
+
1
4
-
1
3
1
4
+
4
5
)÷
7
3
+
7
10
34.5×9.23-34.5+1.77×34.52-
6
13
÷
9
26
-
2
3
答案

(1)57.26-(5.26-1.5),

=57.26-5.26+1.5,

=52+1.5,

=53.5;

(2)64×1.25×2.5,

=8×8×1.25×2.5,

=(8×1.25)×(8×2.5),

=10×20,

=200;

(3)(

4
9
+
2
15
)÷
2
15

=(

4
9
+
2
15
)×
15
2

=

4
9
×
15
2
+
2
15
×
15
2

=

10
3
+1,

=4

1
3

(4)4.8×3.9+6.1×4

4
5

=(3.9+6.1)×4.8,

=10×4.8,

=48;

(5)12×(

1
6
+
1
4
-
1
3
),

=12×

1
6
+12×
1
4
-12×
1
3

=2+3-4,

=1;

(6)(

1
4
+
4
5
)÷
7
3
+
7
10

=(

1
4
+
4
5
)×
3
7
+
7
10

=

21
20
×
3
7
+
7
10

=

9
20
+
14
20

=1

3
20

(7)34.5×9.23-34.5+1.77×34.5,

=34.5×(9.23-1+1.77),

=34.5×10,

=345;

(8)2-

6
13
÷
9
26
-
2
3

=2-

6
13
×
26
9
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3
),

=0.

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