题目内容
怎样简便怎样计算.
|
| 2006×
| ||||||||||||||||||
3
|
|
|
(1)
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 2 |
| 9 |
| 5 |
| 11 |
=6×15,
=90;
(2)
| 2 |
| 7 |
| 3 |
| 4 |
| 3 |
| 4 |
=
| 2 |
| 7 |
| 4 |
| 3 |
| 3 |
| 4 |
=
| 2 |
| 7 |
| 7 |
| 12 |
=
| 1 |
| 6 |
(3)2006×
| 2004 |
| 2005 |
=(2005+1)×
| 2004 |
| 2005 |
=2005×
| 2004 |
| 2005 |
| 2004 |
| 2005 |
=2004+
| 2004 |
| 2005 |
=2004
| 2004 |
| 2005 |
(4)3
| 3 |
| 4 |
| 2 |
| 5 |
=3.75×2.6+1.4×3.75,
=3.75×(2.6+1.4),
=3.75×4,
=15;
(5)
| 19 |
| 43 |
| 19 |
| 43 |
| 19 |
| 43 |
=
| 19 |
| 43 |
=
| 19 |
| 43 |
=38;
(6)
| 5 |
| 6 |
| 1 |
| 10 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 5 |
| 6 |
| 1 |
| 10 |
| 1 |
| 2 |
| 1 |
| 10 |
| 2 |
| 3 |
| 1 |
| 10 |
=(
| 5 |
| 6 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 10 |
=5×
| 1 |
| 10 |
=
| 1 |
| 2 |
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