题目内容

怎样简便就怎样算.
(1)3-
7
12
-
5
12
(2)
5
7
×
3
8
+
5
8
×
5
7
(3)
8
15
×
5
16
+
5
27
÷
10
9
(4)18×(
4
9
+
5
6
(5)(
5
7
×
4
7
+
4
7
)÷
4
7
(6)
1
5
÷[(
2
3
+
1
5
)×
1
13
].
(1)3-
7
12
-
5
12

=3-(
7
12
+
5
12
),
=3-1,
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=(
3
8
+
5
8
)×
5
7

=1×
5
7

=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
8
15
×
5
16
+
5
27
×
9
10

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6
),
=18×
4
9
+18×
5
6

=8+15,
=23;

(5)(
5
7
×
4
7
+
4
7
)÷
4
7

=(
5
7
×
4
7
+
4
7
)×
7
4

=
5
7
×
4
7
×
7
4
+
4
7
×
7
4

=
5
7
+1,
=1
5
7


(6)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=
1
5
×15,
=3.
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