题目内容

20.2-3.55-6.45(
1
2
-
3
8
3
8
1
10
×
5
6
÷
1
24
5
11
×7+4÷
11
5
(455-12.5×4)÷8.1[1-(
1
3
+
1
4
)]÷
5
11
(1)20.2-3.55-6.45,
=20.2-(3.55+6.45),
=20.2-10,
=10.2;

(2)(
1
2
-
3
8
3
8

=(
1
2
-
3
8
8
3

=
1
2
×
8
3
-
3
8
×
8
3

=
4
3
-1

=
1
3


(3)
1
10
×
5
6
÷
1
24

=
1
10
×
5
6
×24

=2;

(4)
5
11
×7+4÷
11
5

=
5
11
×7+4×
5
11

=
5
11
×(7+4)

=
5
11
×11

=5;

(5)(455-12.5×4)÷8.1,
=(455-50)÷8.1,
=405÷8.1,
=50;

(6)[1-(
1
3
+
1
4
)]÷
5
11

=[1-
7
12
]÷
5
11

=
5
12
×
11
5

=
11
12
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