計算:
9
16
÷
1
10
×
8
25
7
9
×
3
35
×
18
4
12÷(
4
7
×
14
5
7
15
÷3×
5
14
3
16
÷(1÷
8
3
7
24
÷
3
5
×
6
35
1
2
+4×
7
8
27×(3-
4
9
5
21
÷
1
3
-
4
21
7
4
×
3
5
×
2
7
5
6
×26+
1
6
×26
2
5
×
1
6
+
3
5
÷
3
2
分析:(1)(4)(6)(10)可根據(jù)乘法交換律計算;
(2)(3)(5)(7)(9)(12)根據(jù)四則混合運算的運算順序計算即可;
(8)(11)根據(jù)乘法分配律計算即可.
解答:解:(1)
9
16
÷
1
10
×
8
25

=
9
16
×
8
25
×10,
=
9
5


(2)
7
9
×
3
35
×
18
4
=
3
10
;

(3)12÷(
4
7
×
14
5

=12×
5
8
,
=
15
2


(4)
7
15
÷3×
5
14

=
7
15
×
5
14
×
1
3
,
=
1
18


(5)
3
16
÷(1÷
8
3

=
3
16
×
8
3
,
=
1
2
;

(6)
7
24
÷
3
5
×
6
35

=
7
24
×
6
35
×
5
3
,
=
1
12
;

(7)
1
2
+4×
7
8

=
1
2
+
7
2
,
=4;

(8)27×(3-
4
9

=27×3-27×
4
9

=51-12,
=39;

(9)
5
21
÷
1
3
-
4
21

=
15
21
-
4
21
,
=
11
21
;

(10)
7
4
×
3
5
×
2
7

=
7
4
×
2
7
×
3
5

=
1
2
×
3
5
,
=
3
10


(11)
5
6
×26+
1
6
×26
=(
5
6
+
1
6
)×26,
=1×26,
=26;

(12)
2
5
×
1
6
+
3
5
÷
3
2

=
1
15
+
6
15
,
=
7
15
點評:完成本細心分析式中數(shù)據(jù),注意通分約分.
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計算下面各題,能簡算的要簡算.
4
5
-
1
10
-
7
10

7
20
+
3
5
-
3
4
4
5
-(
3
4
-
5
12
16
25
-(
14
19
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9
25
8-
9
16
-
7
16
8
27
+9.37+
19
27
+0.63.

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