问题 解答题
计算
①5.2×1
1
4
+2
4
5
÷
4
5

2
5
8
-(
2
3
+
1
4
+
5
6

③[3.75-(
1
5
+
1
3
)×4
1
2
3
5

1
4
÷(0.6×1.25+1
1
8
+
1
4

⑤(7
1
3
×2+7
1
3
+7
1
3
)÷4
9
1
9
+8
1
8
-7
1
7
9
1
9
-5
1
7
+6
1
8

⑦(
14
35
×4.27+8.54×
21
30
)÷4.27×25%
1
1
6
+3
1
12
+5
1
20
+7
1
30
+9
1
42
答案

①5.2×1

1
4
+2
4
5
÷
4
5

=5.2×

5
4
+2.8×
5
4

=(5.2+2.8)×

5
4

=8×

5
4

=10;

2

5
8
-(
2
3
+
1
4
+
5
6
),

=2

5
8
-(
8
12
+
3
12
+
10
12

=2

5
8
-1
3
4

=

7
8

③[3.75-(

1
5
+
1
3
)×4
1
2
3
5

=[3.75-

8
15
×
9
2
3
5

=[3.75-2.4]÷0.6,

=1.35÷0.6,

=2.25;

1
4
÷(0.6×1.25+1
1
8
+
1
4
),

=

1
4
÷(
3
5
×
5
4
+1
1
8
+
1
4
),

=

1
4
÷(
3
4
+
1
4
+1
1
8

=

1
4
×
8
17

=

2
17

⑤(7

1
3
×2+7
1
3
+7
1
3
)÷4,

=7

1
3
×(2+1+1)÷4

=7

1
3
×4÷4,

=7

1
3

9
1
9
+8
1
8
-7
1
7
9
1
9
-5
1
7
+6
1
8

=

(9+8-7)+(
1
9
+
1
8
-
1
7
)
(9-5+6)+(
1
9
+
1
8
-
1
7
)

=

10+(
1
9
+
1
8
-
1
7
)
10+(
1
9
+
1
8
-
1
7
)

=1;

⑦(

14
35
×4.27+8.54×
21
30
)÷4.27×25%,

=(0.4×4.27+8.54×0.7)÷4.27×0.25,

=(1.708+5.978)×0.25÷4.27,

=7.686×0.25÷4.27,

=1.9215÷4.27,

=0.45;

1

1
6
+3
1
12
+5
1
20
+7
1
30
+9
1
42

=(1+3+5+7+9)+(

1
6
+
1
12
+
1
20
+
1
30
+
1
42
),

=25+(

1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
),

=25+(

1
2
-
1
7
),

=25+

5
14

=25

5
14

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