题目内容
计算:(要求写出计算过程)
(1)51
×
+61
×
+71
×
(2)1-
×{1-
×[1-
×(1-
)]}
(3)[1-(
+
)×4]÷(
÷
)
(4)2008×1
÷1
-100
÷
.
(1)51
1 |
4 |
4 |
5 |
1 |
5 |
5 |
6 |
1 |
6 |
6 |
7 |
(2)1-
1 |
2 |
1 |
3 |
1 |
4 |
1 |
5 |
(3)[1-(
1 |
12 |
1 |
15 |
3 |
10 |
9 |
25 |
(4)2008×1
1 |
2 |
1 |
3 |
2 |
5 |
1 |
20 |
(1)51
×
+61
×
+71
×
,
=(50+
)×
+(60+
)×
+(70+
)×
,
=(40+1)+(50+1)+(60+1),
=150+3,
=153;
(2)1-
×{1-
×[1-
×(1-
)]},
=1-
×{1-
×[1-
×
]},
=1-
×{1-
×[1-
]},
=1-
×{1-
×
},
=1-
×{1-
},
=1-
×
,
=1-
,
=
;
(3)[1-(
+
)×4]÷(
÷
),
=[1-
×4]÷(
×
),
=[1-
]÷
,
=
×
,
=
;
(4)2008×1
÷1
-100
÷
,
=2008×
×
-
×20,
=2008×
×
-2008,
=2008×(
×
-1)
=2008×
,
=251.
1 |
4 |
4 |
5 |
1 |
5 |
5 |
6 |
1 |
6 |
6 |
7 |
=(50+
5 |
4 |
4 |
5 |
6 |
5 |
5 |
6 |
7 |
6 |
6 |
7 |
=(40+1)+(50+1)+(60+1),
=150+3,
=153;
(2)1-
1 |
2 |
1 |
3 |
1 |
4 |
1 |
5 |
=1-
1 |
2 |
1 |
3 |
1 |
4 |
4 |
5 |
=1-
1 |
2 |
1 |
3 |
1 |
5 |
=1-
1 |
2 |
1 |
3 |
4 |
5 |
=1-
1 |
2 |
4 |
15 |
=1-
1 |
2 |
11 |
15 |
=1-
11 |
30 |
=
19 |
30 |
(3)[1-(
1 |
12 |
1 |
15 |
3 |
10 |
9 |
25 |
=[1-
3 |
20 |
3 |
10 |
25 |
9 |
=[1-
3 |
5 |
5 |
6 |
=
2 |
5 |
6 |
5 |
=
12 |
25 |
(4)2008×1
1 |
2 |
1 |
3 |
2 |
5 |
1 |
20 |
=2008×
3 |
2 |
3 |
4 |
502 |
5 |
=2008×
3 |
2 |
3 |
4 |
=2008×(
3 |
2 |
3 |
4 |
=2008×
1 |
8 |
=251.
练习册系列答案
相关题目