题目内容
简便运算
(1)13×
+0.34×
+13×
+
×0.34
(2)
+
+
+
+
+
+
+
+
(3)2009÷2009
.
(1)13×
| 2 |
| 3 |
| 2 |
| 7 |
| 1 |
| 3 |
| 5 |
| 7 |
(2)
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 5 |
| 5 |
| 7 |
| 7 |
| 8 |
| 9 |
| 20 |
| 10 |
| 21 |
| 11 |
| 24 |
| 19 |
| 35 |
(3)2009÷2009
| 2009 |
| 2010 |
(1)13×
+0.34×
+13×
+
×0.34,
=(13×
+13×
)+(0.34×
+
×0.34),
=(
+
)×13+(
+
)×0.34,
=1×13+1×0.34,
=13+0.34,
=13.34;
(2)
+
+
+
+
+
+
+
+
,
=
+
+
+
+
+(
+
)+(
+
)+(
+
)+(
+
),
=
+
+
+
+
+(
+
)+(
+
)+(
+
)+(
+
+
),
=
×3+(
+
)+(
+
×3)+(
+
×2)+(
+
),
=1+1+1+1+1,
=5;
(3)2009÷2009
,
=2009÷
,
=2009÷
,
=2009×
,
=
.
| 2 |
| 3 |
| 2 |
| 7 |
| 1 |
| 3 |
| 5 |
| 7 |
=(13×
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=(
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=1×13+1×0.34,
=13+0.34,
=13.34;
(2)
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 5 |
| 5 |
| 7 |
| 7 |
| 8 |
| 9 |
| 20 |
| 10 |
| 21 |
| 11 |
| 24 |
| 19 |
| 35 |
=
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 5 |
| 5 |
| 7 |
| 7 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 7 |
| 1 |
| 3 |
| 1 |
| 8 |
| 12 |
| 35 |
| 7 |
| 35 |
=
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 5 |
| 5 |
| 7 |
| 7 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 7 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 7 |
| 1 |
| 5 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
| 1 |
| 5 |
| 5 |
| 7 |
| 1 |
| 7 |
| 7 |
| 8 |
| 1 |
| 8 |
=1+1+1+1+1,
=5;
(3)2009÷2009
| 2009 |
| 2010 |
=2009÷
| 2009×2010+2009 |
| 2010 |
=2009÷
| 2009×(2010+1) |
| 2010 |
=2009×
| 2010 |
| 2009×2011 |
=
| 2010 |
| 2011 |
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