题目内容

计算.(能简算的要简算)
3.68×[1÷(2.1-2.09)]
5
2
3
÷1
4
5
+
4
9
×5
2
3
+5
2
3

4-[3.75×(1.2-
1
3
)+
3
4
]
4
9
÷(
7
9
+
4
9
)×2
3
4
(1)3.68×[1÷(2.1-2.09)]
=3.68×[1÷0.01],
=3.68×100,
=368;
(2)5
2
3
÷1
4
5
+
4
9
×5
2
3
+5
2
3

=5
2
3
×
5
9
+
4
9
×5
2
3
+5
2
3

=(
5
9
+
4
9
+1)×5
2
3

=2×5
2
3

=11
1
3

(3)4-[3.75×(1.2-
1
3
)+
3
4
]
=4-[
15
4
×(
6
5
-
1
3
)+
3
4
],
=4-[
15
4
×
13
15
+
3
4
],
=4-[
13
4
+
3
4
],
=4-4,
=0;
(4)9÷(
7
9
+
4
9
)×2
3
4

=9÷
11
9
×
11
4

=9×
9
11
×
11
4

=20
1
4
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