题目内容

下面各题怎样算简便就怎样算.
①(
1
2
-
2
7
)×14
4
13
×
1
7
+
4
13
×
6
7
③15×(9.6-8.6)÷1.2
④15-
9
20
-
3
5
⑤(10×
2
5
+6)×
13
14
2
3
×[1-(
1
3
-
1
4
)]×
5
11
①(
1
2
-
2
7
)×14
=
1
2
×14-
2
7
×
14,
=7-4,
=3;

4
13
×
1
7
+
4
13
×
6
7

=(
1
7
+
6
7
)×
4
13

=1×
4
13

=
4
13


③15×(9.6-8.6)÷1.2
=15×1÷1.2,
=15÷1.2,
=12.5;

④15-
9
20
-
3
5

=15-
9
20
-
12
20

=14
11
20
-
12
20

=13
19
20


⑤(10×
2
5
+6)×
13
14

=(4+6)×
13
14

=10×
13
14

=
65
7


2
3
×[1-(
1
3
-
1
4
)]×
5
11

=
2
3
×[1-(
4
12
-
3
12
)]×
5
11

=
2
3
×[1-
1
12
5
11

=
2
3
×
11
12
×
5
11

=
5
18
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