题目内容
灵活选择算法脱式计算
(1)
÷(3-
-
)
(2)2011×
(3)125×(8+0.8+0.08)
(4)
÷
+
×
.
(1)
| 1 |
| 5 |
| 7 |
| 13 |
| 6 |
| 13 |
(2)2011×
| 2009 |
| 2010 |
(3)125×(8+0.8+0.08)
(4)
| 7 |
| 9 |
| 11 |
| 5 |
| 5 |
| 9 |
| 2 |
| 11 |
(1)
÷(3-
-
)
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
;
(2)2011×
=(2010+1)×
,
=2010×
+1×
,
=2009+
,
=2009
;
(3)125×(8+0.8+0.08)
=125×8+125×0.8+125×0.08,
=1000+100+10,
=1110;
(4)
÷
+
×
=
×
+
×
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
.
| 1 |
| 5 |
| 7 |
| 13 |
| 6 |
| 13 |
=
| 1 |
| 5 |
| 7 |
| 13 |
| 6 |
| 13 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
=
| 1 |
| 10 |
(2)2011×
| 2009 |
| 2010 |
=(2010+1)×
| 2009 |
| 2010 |
=2010×
| 2009 |
| 2010 |
| 2009 |
| 2010 |
=2009+
| 2009 |
| 2010 |
=2009
| 2009 |
| 2010 |
(3)125×(8+0.8+0.08)
=125×8+125×0.8+125×0.08,
=1000+100+10,
=1110;
(4)
| 7 |
| 9 |
| 11 |
| 5 |
| 5 |
| 9 |
| 2 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 5 |
| 9 |
| 2 |
| 11 |
=
| 5 |
| 9 |
| 7 |
| 11 |
| 5 |
| 9 |
| 2 |
| 11 |
=
| 5 |
| 9 |
| 7 |
| 11 |
| 2 |
| 11 |
=
| 5 |
| 9 |
| 9 |
| 11 |
=
| 5 |
| 11 |
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