题目内容
简便计算
(1)(
-
)×17×5
(2)
×27+41÷
(3)(1+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
)
(1)(
1 |
15 |
1 |
51 |
(2)
1 |
5 |
5 |
3 |
(3)(1+
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
9 |
1 |
9 |
(1)(
-
)×17×5,
=
×17×5-
×17×5,
=
-
,
=4;
(2)
×27+41÷
,
=
×27+41×
,
=
×9+41×
,
=
×(9+41),
=
×50,
=30;
(3)(1+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
),
=
×
×
×
×…×
×
,
=
×(
×
)×(
×
)×…×(
×
)×
,
=
×
,
=
.
1 |
15 |
1 |
51 |
=
1 |
15 |
1 |
51 |
=
17 |
3 |
5 |
3 |
=4;
(2)
1 |
5 |
5 |
3 |
=
1 |
5 |
3 |
5 |
=
3 |
5 |
3 |
5 |
=
3 |
5 |
=
3 |
5 |
=30;
(3)(1+
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
9 |
1 |
9 |
=
3 |
2 |
1 |
2 |
4 |
3 |
2 |
3 |
10 |
9 |
8 |
9 |
=
1 |
2 |
3 |
2 |
2 |
3 |
4 |
3 |
3 |
4 |
9 |
8 |
8 |
9 |
10 |
9 |
=
1 |
2 |
10 |
9 |
=
5 |
9 |
练习册系列答案
相关题目