题目内容

用递等式计算.
370×203-19266÷38 32×3.1+1÷1.25
21
26
×(39÷35)÷0.9
(9-3.06÷
3
5
)×1
3
13
(3-1
1
8
+1
1
7
)×1
8
13
-3
1
56
[(
37
40
+0.075)÷
3
25
-2
17
24
2
15
分析:根据整数、分数和小数的四则混合运算进行计算即可得到答案.
解答:
解:(1)370×203-19266÷38
=75110-507,
=74603;

(2)32×3.1+1÷1.25
=99.2+0.8,
=100;
(3)
21
26
×(39÷35)÷0.9
=
21
26
×
39
35
÷0.9,
=
9
10
÷0.9,
=1;

(4)(9-3.06÷
3
5
)×1
3
13

=(9-3.06÷
3
5
)×1
3
13

=(9-5.1)×1
3
13

=3.9×1
3
13

=4
4
5


(5)(3-1
1
8
+1
1
7
)×1
8
13
-3
1
56

=(1
7
8
+1
1
7
)×1
8
13
-3
1
56

=3
1
56
×1
8
13
-3
1
56

=3
1
56
×(1
8
13
-1)
=3
1
56
×
8
13

=1
6
7


(6)[(
37
40
+0.075)÷
3
25
-2
17
24
2
15

={1÷
3
25
-2
17
24
2
15

={
25
3
-2
17
24
2
15

=5
5
8
×
2
15

=
3
4
点评:此题主要考查的是整数、分数和小数的四则混合运算.
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