题目内容
简便运算.
(
+
)×23+
×100+100×
23
×3
+
+
+
+
200.9×10%+2.009×490+0.2009×5000.
(
| 2 |
| 71 |
| 1 |
| 69 |
| 25 |
| 71 |
| 5 |
| 8 |
| 3 |
| 8 |
23
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
200.9×10%+2.009×490+0.2009×5000.
①(
+
)×23+
,
=
×23+
×23+
,
=(
+
)+
,
=1+
,
=1
;
②
×100+100×
,
=100×(
+
),
=100×1,
=100;
③23
×3
+
+
+
+
,
=
×
+
-
+…+
-
,
=
+
-
,
=
+
,
=
,
=83
;
④200.9×10%+2.009×490+0.2009×5000,
=20.09×1+20.09×49+20.09×50,
=20.09×(1+49+50),
=20.09×100,
=2009.
| 2 |
| 71 |
| 1 |
| 69 |
| 25 |
| 71 |
=
| 2 |
| 71 |
| 1 |
| 69 |
| 25 |
| 71 |
=(
| 46 |
| 71 |
| 25 |
| 71 |
| 23 |
| 69 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
②
| 5 |
| 8 |
| 3 |
| 8 |
=100×(
| 5 |
| 8 |
| 3 |
| 8 |
=100×1,
=100;
③23
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
=
| 71 |
| 3 |
| 7 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 6 |
=
| 497 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 497 |
| 6 |
| 2 |
| 6 |
=
| 499 |
| 6 |
=83
| 1 |
| 6 |
④200.9×10%+2.009×490+0.2009×5000,
=20.09×1+20.09×49+20.09×50,
=20.09×(1+49+50),
=20.09×100,
=2009.
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