问题 解答题
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
答案

(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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