问题 解答题
脱式计算.(能简算的要简算)
5×6.6+7.5×6.6

11
23
×24

24×(
2
3
-
1
4
+
5
12
1
15
÷3.25+
8
13
3
15
+
4
13
÷3.75.
答案

(1)5×6.6+7.5×6.6,

=(5+7.5)×6.6,

=12.5×6.6,

=82.5;

(2)

11
23
×24,

=

11
23
×(23+1),

=

11
23
×23+
11
23
×1,

=11+

11
23

=11

11
23

(3)24×(

2
3
-
1
4
+
5
12
),

=24×

2
3
-24×
1
4
+
24×
5
12

=16-6+10,

=20;

(4)

1
15
÷3.25+
8
13

=

1
15
÷3
1
4
+
8
13

=

1
15
×
4
13
+
8
13

=

4
195
+
8
13

=

4
195
+
120
195

=

124
195

(5)

3
15
+
4
13
÷3.75,

=

3
15
+
4
13
÷3
3
4

=

3
15
+
4
13
×
4
15

=

3
15
+
16
195

=

39
195
+
16
195

=

55
195

=

11
39

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