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递等式计算.(能简算的要简算)19.67-(1.67+229)-179(4-3.6×23)÷451118×27+117×5183.5×45+5.5×80%+0.86.4×1.25×2.52008÷2009×2010.
题目详情
递等式计算.(能简算的要简算)
19.67-(1.67+2
)-1
(4-3.6×
)÷
×
+
×
3.5×
+5.5×80%+0.8
6.4×1.25×2.5
2008÷2009×2010.
19.67-(1.67+2
2 |
9 |
7 |
9 |
(4-3.6×
2 |
3 |
4 |
5 |
11 |
18 |
2 |
7 |
11 |
7 |
5 |
18 |
3.5×
4 |
5 |
6.4×1.25×2.5
2008÷2009×2010.
▼优质解答
答案和解析
(1)19.67-(1.67+2
)-1
,
=19.67-1.67-2
-1
,
=(19.67-1.67)-(2
+1
),
=18-4,
=14;
(2)(4-3.6×
)÷
,
=(4-2.4)÷
,
=1.6÷
,
=2;
(3)
×
+
×
,
=
×
+
×
,
=
×(
+
),
=
;
(4)3.5×
+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(5)6.4×1.25×2.5,
=(8×0.8)×1.25×2.5,
=(8×1.25)×(8×2.5),
=10×20,
=200;
(6)2008÷2009×2010,
=
×2010,
=
×(2009+1),
=
×2009+
×1,
=2008+
,
=2008
.
(1)19.67-(1.67+2
2 |
9 |
7 |
9 |
=19.67-1.67-2
2 |
9 |
7 |
9 |
=(19.67-1.67)-(2
2 |
9 |
7 |
9 |
=18-4,
=14;
(2)(4-3.6×
2 |
3 |
4 |
5 |
=(4-2.4)÷
4 |
5 |
=1.6÷
4 |
5 |
=2;
(3)
11 |
18 |
2 |
7 |
11 |
7 |
5 |
18 |
=
11 |
18 |
2 |
7 |
11 |
18 |
5 |
7 |
=
11 |
18 |
2 |
7 |
5 |
7 |
=
11 |
18 |
(4)3.5×
4 |
5 |
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(5)6.4×1.25×2.5,
=(8×0.8)×1.25×2.5,
=(8×1.25)×(8×2.5),
=10×20,
=200;
(6)2008÷2009×2010,
=
2008 |
2009 |
=
2008 |
2009 |
=
2008 |
2009 |
2008 |
2009 |
=2008+
2008 |
2009 |
=2008
2008 |
2009 |
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