问题 解答题
9
14
×
3
8
÷
3
14
2
9
×
3
5
+
4
9
×
3
5
2.8×(
1
7
+
3
28
1
2
-
1
4
÷
5
8
)×
5
7
19
4
×
1
5
+
19
4
÷
5
4
+
19
4
答案

(1)

9
14
×
3
8
÷
3
14

=

9
14
×
3
8
×
14
3

=1

1
8

(2)

2
9
×
3
5
+
4
9
×
3
5

=(

2
9
+
4
9
)×
3
5

=

2
3
×
3
5

=

2
5

(3)2.8×(

1
7
+
3
28
),

=2.8×

1
7
+
3
28
×2.8,

=0.4+0.3,

=0.7;

(4)(

1
2
-
1
4
÷
5
8
)×
5
7

=(

1
2
-
2
5
)×
5
7

=

1
10
×
5
7

=

1
14

(5)

19
4
×
1
5
+
19
4
÷
5
4
+
19
4

=

19
4
×
1
5
+
19
4
×
4
5
+
19
4

=

19
4
×(
1
5
+
4
5
+1
),

=9.5.

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