题目内容

计算题.
(1)4-[3.75×(1.2-
1
3
)+
3
4
]

(2)1
3
7
-(
7
9
-
4
7
)+
8
9

(3)1-
1
2
-
1
4
-
1
8
-
1
16
-
1
32

(4)
2
11×13
+
2
13×15
+
2
15×17
+
2
17×19
+
2
19×?21
+
1
21
(1)4-[3.75×(1.2-
1
3
)+
3
4
],
=4-[
15
4
×(
6
5
-
1
3
)+
3
4
]

=4-[
15
4
×
6
5
-
15
4
×
1
3
+
3
4
]

=4-[
9
2
-
5
4
+
3
4
],
=4-4,
=0;
(2)1
3
7
-(
7
9
-
4
7
)+
8
9

=1
3
7
-
7
9
+
4
7
+
8
9

=(1
3
7
+
4
7
)+(
8
9
-
7
9
)

=2+
1
9

=2
1
9

(3)1-
1
2
-
1
4
-
1
8
-
1
16
-
1
32

=
1
2
-(
1
2
-
1
4
)-(
1
4
-
1
8
)-(
1
8
-
1
16
)-(
1
16
-
1
32
),
=
1
2
-
1
2
+
1
4
-
1
4
+
1
8
-
1
8
+
1
16
-
1
16
+
1
32

=
1
32

(4)
2
11×13
+
2
13×15
+
2
15×17
+
2
17×19
+
2
19×?21
+
1
21

=(
1
11
-
1
13
)+(
1
13
-
1
15
)+(
1
15
-
1
17
)+
(
1
17
-
1
19
)+(
1
19
-
1
21
)+
1
21

=
1
11
-
1
13
+
1
13
-
1
15
+
1
15
-
1
17
+
1
17
-
1
19
+
1
19
-
1
21
+
1
21

=
1
11
-
1
21
+
1
21

=
1
11
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