脱式计算,能简算的要简算 22.3-2.45-5.3-4.55 9 20 ÷[ 1 2 ×( 2 5

2024-11-23 03:23:17
推荐回答(1个)
回答1:


(1)22.3-2.45-5.3-4.55,
=(22.3-5.3)-(2.45+4.55),
=17-7,
=10;

(2)
9
20
÷[
1
2
×(
2
5
+
1
3
)]

=
9
20
÷[
1
2
×
11
15
],
=
9
20
÷
11
30

=
27
22


(3)[43.3×(2-75%)+7]×
1
2

=[43.3×1.25+7]×
1
2

=[54.125+7]×
1
2

=61.125×
1
2

=30.5625;

(4)
9
20
×103-
9
20
×3

=
9
20
×(103-3)

=
9
20
×100

=45;

(5)
5
9
÷5+
4
9
÷4

=
1
9
+
1
9

=
2
9


(6) 12-
6
13
÷
9
26
-
2
3

=12-
4
3
-
2
3

=12-(
4
3
+
2
3
),
=12-2,
=10.