题目内容
| 怎样算简便就怎样算. ①
| ②(7.5+7.5+7.5+7.5)×125×2 | ③1-(
| ④
|
①
+0.2+
+
=(
+
)+(0.2+0.8),
=1+1,
=2;
②(7.5+7.5+7.5+7.5)×125×2
=7.5×4×(125×2),
=7.5×(4×250),
=7.5×1000
=7500;
③1-(
-
)×3
=1-(
-
)×3,
=1-
×3,
=1-
,
=
;
④
×0.25+
×
=
×0.25+0.25×
,
=(
+
)×0.25,
=1×0.25,
=0.25.
| 7 |
| 13 |
| 6 |
| 13 |
| 4 |
| 5 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
=1+1,
=2;
②(7.5+7.5+7.5+7.5)×125×2
=7.5×4×(125×2),
=7.5×(4×250),
=7.5×1000
=7500;
③1-(
| 7 |
| 12 |
| 1 |
| 2 |
=1-(
| 7 |
| 12 |
| 6 |
| 12 |
=1-
| 1 |
| 12 |
=1-
| 1 |
| 4 |
=
| 3 |
| 4 |
④
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 6 |
=(
| 5 |
| 6 |
| 1 |
| 6 |
=1×0.25,
=0.25.
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