题目内容

下面各题,怎样算简便就怎样算.
(1)
11
10
-
1
4
-
3
4
+
9
10

(2)87×
7
88

(3)
5
9
÷5+5÷
5
9

(4)
4
15
÷(
13
9
-
2
3
×
5
6
(1)
11
10
-
1
4
-
3
4
+
9
10

=(
11
10
+
9
10
)-(
1
4
+
3
4
),
=2-1,
=1;
(2)87×
7
88

=(88-1)×
7
88

=7-
7
88

=6
81
88

(3)
5
9
÷5+5÷
5
9

=
5
9
×
1
5
+5×
9
5

=
1
9
+9,
=9
1
9

(4)
4
15
÷(
13
9
-
2
3
×
5
6
),
=
4
15
÷(
13
9
-
5
9
),
=
4
15
×
9
8

=
3
10
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