问题 解答题
计算.
(1)9
5
6
×4.25+4
1
4
×
1
6

(2)[22.5+(3
3
5
+1.8-1.21×
5
11
)]÷40%

(3)
3
10
×
3
8
+
1
15
×
7
16
+
1
5
×3
1
2

(4)
7
18
×
9
2
+
1
6
13
1
3
-
15
4
×
16
5
答案

(1)9

5
6
×4.25+4
1
4
×
1
6

=(9

5
6
+
1
6
)×4.25,

=10×4.25,

=42.5;

(2)[22.5+(3

3
5
+1.8-1.21×
5
11
)]÷40%,

=[22.5+(3.6+1.8-0.55)]÷40%,

=[22.5+(5.4-0.55)]÷40%,

=[22.5+4.85]÷0.4,

=27.35÷0.4,

=68.375;

(3)

3
10
×
3
8
+
1
15
×
7
16
+
1
5
×3
1
2

=

9
80
+
7
240
+
7
10

=

34
240
+
168
240

=

101
120

(4)

7
18
×
9
2
+
1
6
13
1
3
-
15
4
×
16
5

=

7
4
+
1
6
13
1
3
-12

=

23
12
4
3

=

23
12
×
3
4

=

23
16

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