问题 解答题
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
+
1
3
)]
[43.3×(2-75%)+7]×
1
2
9
20
×103-
9
20
×3
5
9
÷5+
4
9
÷4
12-
6
13
÷
9
26
-
2
3
答案

(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.

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