题目内容

(1)(28×
7
4
+12×175%)÷
21
8

(2)0.35÷0.125÷64÷0.5÷0.25
(3)1.25×98+12
1
2
×
1
10
+1
1
4

(4)3
3
5
×2345+555÷
25
256
+654.3×36
(5)
1
2
+
5
6
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

(6)
x
1×2
+
x
2×3
+…
x
2008×2009
=2008.
(1)(28×
7
4
+12×175%)÷
21
8

=(28×
7
4
+12×175%)×
8
21

=28×
7
4
×
8
21
+12×175%×
8
21

=
56
3
+8,
=26
2
3


(2)0.35÷0.125÷64÷0.5÷0.25,
=0.35÷(0.125×64×0.5×0.25),
=0.35÷(0.125×8×8×0.5×0.25),
=0.35÷[(0.125×8)×(0.5×0.25×8)],
=0.35÷[1×1],
=0.35÷1,
=0.35;

(3)1.25×98+12
1
2
×
1
10
+1
1
4

=1.25×98+12.5×0.1+1.25,
=1.25×98+1.25×1+1.25,
=1.25×(98+1+1),
=1.25×100,
=125;

(4)3
3
5
×2345+555÷
25
256
+654.3×36,
=3.6×2345+555÷
25
256
+6543×3.6,
=3.6×2345+6543×3.6+555÷
25
256

=3.6×(2345+6543)+555×
256
25

=3.6×8888+5683.2,
=37680;

(5)
1
2
+
5
6
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

=1-
1
2
+
1
2
+
1
3
-
1
3
-
1
4
+
1
4
+
1
5
-
1
5
-
1
6
+
1
6
+
1
7
-
1
7
-
1
8

=1-
1
8

=
7
8


(6)
x
1×2
+
x
2×3
+…
x
2008×2009
=2008,
x-
x
2
+
x
2
-
x
3
+…+
x
2008
-
x
2009
=2008,
x-
x
2009
=2008,
2008
2009
x=2008,
2008
2009
2008
2009
=2008÷
2008
2009

x=2009.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网