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【计算下列各题,能简便的要简便计算.618÷45+1620118÷(14+2.5×45)67-67×(23+19)2008÷200820082009.200.8×73-6.3×200899-97+95
题目内容:
计算下列各题,能简便的要简便计算.
618÷45+1620
11 8
÷(1 4
+2.5×4 5
) 6 7
-6 7
×(2 3
+1 9
) 2008÷20082008 2009
. 200.8×73-6.3×2008 99-97+95-93+91-89+…+7-5+3-1.
优质解答
(1)618÷45+1620,
=1311 15
+1620,
=163311 15
;
(2)11 8
÷(1 4
+2.5×4 5
),
=11 8
÷(1 4
+2),
=11 8
÷9 4
,
=9 8
×4 9
,
=1 2
;
(3)6 7
-6 7
×(2 3
+1 9
),
=6 7
×(1-2 3
-1 9
),
=6 7
×2 9
,
=4 21
;
(4)2008÷20082008 2009
,
=2008÷2008×2009+2008 2009
,
=2008÷2008×2010 2009
,
=2008×2009 2008×2010
,
=2009 2010
;
(5)200.8×73-6.3×2008,
=2008×7.3-6.3×2008,
=2008×(7.3-6.3),
=2008×1,
=2008;
(6)99-97+95-93+91-89+…+7-5+3-1,
=(99-97)+(95-93)+(91-89)+…+(7-5)+(3-1),
=2+2+2+2+…+2+2(25个2),
=2×25,
=50.
计算下列各题,能简便的要简便计算. 618÷45+1620 | 1
| ||||||||||
| 2008÷2008
| ||||||||||
200.8×73-6.3×2008 | 99-97+95-93+91-89+…+7-5+3-1. |
优质解答
=13
11 |
15 |
=1633
11 |
15 |
(2)1
1 |
8 |
1 |
4 |
4 |
5 |
=1
1 |
8 |
1 |
4 |
=1
1 |
8 |
9 |
4 |
=
9 |
8 |
4 |
9 |
=
1 |
2 |
(3)
6 |
7 |
6 |
7 |
2 |
3 |
1 |
9 |
=
6 |
7 |
2 |
3 |
1 |
9 |
=
6 |
7 |
2 |
9 |
=
4 |
21 |
(4)2008÷2008
2008 |
2009 |
=2008÷
2008×2009+2008 |
2009 |
=2008÷
2008×2010 |
2009 |
=2008×
2009 |
2008×2010 |
=
2009 |
2010 |
(5)200.8×73-6.3×2008,
=2008×7.3-6.3×2008,
=2008×(7.3-6.3),
=2008×1,
=2008;
(6)99-97+95-93+91-89+…+7-5+3-1,
=(99-97)+(95-93)+(91-89)+…+(7-5)+(3-1),
=2+2+2+2+…+2+2(25个2),
=2×25,
=50.
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