题目内容

计算下列各式.
(1)(3
1
3
-4×
2
3
×0.25-
1
3
)÷
5
3

(2)
7
31
×13+
13
31
×24+51
4
5
×
5
7

(3)(3
1
8
+4
5
7
)×2.5+(6.875+5
2
7
)×2
1
2

(4)
49
12
-
63
20
+
77
30
-
91
42
+
105
56
)-3
1
6
1
24
(1)(3
1
3
-4×
2
3
×0.25-
1
3
)÷
5
3

=(3
1
3
-4×0.25×
2
3
-
1
3
)÷
5
3

=(3
1
3
-
2
3
-
1
3
)÷
5
3

=(3
1
3
-
1
3
-
2
3
÷
5
3

=(3-
2
3
÷
5
3

=
7
3
×
3
5

=
7
5


(2)
7
31
×13+
13
31
×24+51
4
5
×
5
7

=
13
31
×7+
13
31
×24+51
4
5
×
5
7

=
13
31
×(7+24)+51
4
5
×
5
7

=
13
31
×31+51
4
5
×
5
7

=13+37,
=50;

(3)(3
1
8
+4
5
7
)×2
1
2

=
439
56
×
5
2

=
2195
112


(4)
49
12
-
63
20
+
77
30
-
91
42
+
105
56

=7×(
7
12
-
9
20
+
11
30
-
13
42
+
15
56
),
=7×(
1
3
+
1
4
-
1
4
-
1
5
+
1
5
+
1
6
-
1
6
-
1
7
+
1
7
+
1
8
),
=7×(
1
3
+
1
8
),
=7×
11
24

=
77
24
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