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8
9
×
5
16
÷15
11
12
-
1
9
+
5
12
2
5
×
1
4
+
1
2
÷
5
8
4
9
+
2
7
+
5
18
÷
1
2
7
12
×
1
4
÷(
1
3
-
1
4
25×3.2×125
1
6
-
1
3
+
1
4
)×24
14
15
÷(
4
5
+
2
3
)×
10
11
18÷(
1
2
-
1
3
32.6×33-32.6×23
3
4
-
3
4
÷3+
9
25
4
25
×101-
4
25
分析:
8
9
×
5
16
÷15=
1
54
,先把除以15转化为乘
1
15
;横着看第二个先算加
5
12
,再算减法;第3个-第5个,根据运算顺序计算;第6个把3.2分成4×0.8,再用乘法分配律分别计算,然后相乘;第7-9个根据运算顺序计算;第十个利用乘法分配律提取32.6,然后计算;第11个,根据运算顺序计算;第12个,运用乘法分配律提取
4
25
,再计算.
解答:解:
8
9
×
5
16
÷15
=
8
9
×
5
16
×
1
15

=
1
54
11
12
-
1
9
+
5
12

=
11
12
+
5
12
-
1
9

=
11
9
;           
2
5
×
1
4
+
1
2
÷
5
8

=
2
5
×
1
4
+
1
2
×
8
5

=
9
10
4
9
+
2
7
+
5
18
÷
1
2

=
4
9
+
2
7
+
5
18
×2
=
9
7
7
12
×
1
4
÷(
1
3
-
1
4

=
7
12
×
1
4
×12
=
7
4
;     
25×3.2×125
=(25×4)×(8×125)
=10000;
1
6
-
1
3
+
1
4
)×24
=(
2
12
+
3
12
-
4
12
)×24
=2;

 
14
15
÷(
4
5
+
2
3
)×
10
11

=
14
15
÷
22
15
×
10
11

=
7
121
  18÷(
1
2
-
1
3

=18÷
1
6

=108;
32.6×33-32.6×23
=32.6×(33-23)
=326;
3
4
-
3
4
÷3+
9
25

=
3
4
-
3
4
×
1
3
+
9
25

=
43
50
4
25
×101-
4
25

=
4
25
×(101-1)
=16.
点评:此题是对基础知识的掌握情况,做题时应看清数字,确定运算顺序,正确的进行解答.
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