问题 解答题
计算下列各题:
①17.09-3.63-6.37+0.91②10÷〔
8
3
-(
5
13
÷
5
26
+
2
5
)〕
③198÷
4
3
+202×
3
4
7
8
×〔1÷(
7
10
-
7
20
)〕
答案

①17.09-3.63-6.37+0.91,

=(17.09+0.91)-(3.63+6.37),

=18-10,

=8;

②10÷[

8
3
-(
5
13
÷
5
26
+
2
5
)]

=10÷[

8
3
-(
5
13
×
26
5
+
2
5
)]

=10÷[

8
3
-
12
5
]

=10÷[

40
15
-
36
15
]

=10÷

4
15

=10×

15
4

=37.5;

③198÷

4
3
+202×
3
4

=198×

3
4
+202×
3
4

=

3
4
×(198+202),

=300;

7
8
×[1÷(
7
10
-
7
20
)]

=

7
8
×[1÷
7
20
]

=

7
8
×
20
7

=2.5;

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