题目内容

计算:(要求写出计算过程)
(1)51
1
4
×
4
5
+61
1
5
×
5
6
+71
1
6
×
6
7

(2)1-
1
2
×{1-
1
3
×[1-
1
4
×(1-
1
5
)]}

(3)[1-(
1
12
+
1
15
)×4]÷(
3
10
÷
9
25
)

(4)2008×1
1
2
÷1
1
3
-100
2
5
÷
1
20
(1)51
1
4
×
4
5
+61
1
5
×
5
6
+71
1
6
×
6
7

=(50+
5
4
)×
4
5
+(60+
6
5
)×
5
6
+(70+
7
6
)×
6
7

=(40+1)+(50+1)+(60+1),
=150+3,
=153;

(2)1-
1
2
×{1-
1
3
×[1-
1
4
×(1-
1
5
)]},
=1-
1
2
×{1-
1
3
×[1-
1
4
×
4
5
]},
=1-
1
2
×{1-
1
3
×[1-
1
5
]},
=1-
1
2
×{1-
1
3
×
4
5
},
=1-
1
2
×{1-
4
15
},
=1-
1
2
×
11
15

=1-
11
30

=
19
30


(3)[1-(
1
12
+
1
15
)×4]÷(
3
10
÷
9
25
),
=[1-
3
20
×4]÷(
3
10
×
25
9
),
=[1-
3
5
5
6

=
2
5
×
6
5

=
12
25


(4)2008×1
1
2
÷1
1
3
-100
2
5
÷
1
20

=2008×
3
2
×
3
4
-
502
5
×20,
=2008×
3
2
×
3
4
-2008,
=2008×(
3
2
×
3
4
-1)
=2008×
1
8

=251.
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