题目内容

计算下列各题.
(1)
7
8
-
5
6
×
9
10

(2)
2
5
×
4
9
+
2
5
×
5
9

(3)(
2
3
+
1
8
)×(
1
2
-
9
19

(4)
5
7
×[1-(
1
4
+
2
5
)].
(1)
7
8
-
5
6
×
9
10

=
7
8
-
3
4

=
1
8


(2)
2
5
×
4
9
+
2
5
×
5
9

=
2
5
×(
4
9
+
5
9
),
=
2
5
×1,
=
2
5


(3)(
2
3
+
1
8
)×(
1
2
-
9
19
),
=
19
24
×
1
38

=
1
48


(4)
5
7
×[1-(
1
4
+
2
5
)],
=
5
7
×[1-
13
20
],
=
5
7
×
7
20

=
1
4
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