题目内容

灵活计算.
7
8
×
12
13
+
7
8
÷13
1
4
÷(3-
7
15
-
8
15
72×(
1
3
-
1
4
-
1
36
5
12
+
1
19
)×12+
7
19
3
4
-
3
4
×
2
5
)÷
1
5
1
21
×
1
17
×(2009×42×85)
(1)
7
8
×
12
13
+
7
8
÷
13,
=
7
8
×
12
13
+
7
8
×
1
13

=
7
8
×(
12
13
+
1
13
),
=
7
8
×1,
=
7
8


(2)
1
4
÷(3-
7
15
-
8
15
),
=
1
4
÷[3-(
7
15
+
8
15
)],
=
1
4
÷[3-1],
=
1
4
÷
2,
=
1
8


(3)72×(
1
3
-
1
4
-
1
36
),
=72×
1
3
-72×
1
4
-72×
1
36

=24-18-2,
=4;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=6;

(5)(
3
4
-
3
4
×
2
5
)÷
1
5

=[
3
4
×(1-
2
5
)]×5,
=[
3
4
×
3
5
]×5,
=
9
20
×5,
=
9
4


(6)
1
21
×
1
17
×(2009×42×85),
=(
1
21
×
42)×(
1
17
×85)×2009,
=2×5×2009,
=20090;
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