题目内容
| 怎样简便就怎样算. ①
| ②12.5×0.32×25 | ③
| ④
|
①
-0.375+
-
,
=
-
+
-
,
=(
+
)-
-
,
=(
+
)-(
+
),
=
-1,
=
;
②12.5×0.32×25,
=12.5×0.8×0.4×25,
=(12.5×0.8)×(0.4×25),
=10×10,
=100;
③
÷6+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
④
×0.25+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 5 |
| 9 |
| 11 |
| 18 |
| 5 |
| 8 |
=
| 5 |
| 9 |
| 3 |
| 8 |
| 11 |
| 18 |
| 5 |
| 8 |
=(
| 5 |
| 9 |
| 11 |
| 18 |
| 3 |
| 8 |
| 5 |
| 8 |
=(
| 5 |
| 9 |
| 11 |
| 18 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 7 |
| 6 |
=
| 1 |
| 6 |
②12.5×0.32×25,
=12.5×0.8×0.4×25,
=(12.5×0.8)×(0.4×25),
=10×10,
=100;
③
| 9 |
| 20 |
| 1 |
| 6 |
| 1 |
| 20 |
=
| 9 |
| 20 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 20 |
=(
| 9 |
| 20 |
| 1 |
| 20 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 6 |
=
| 1 |
| 12 |
④
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
=(
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 4 |
=1×
| 1 |
| 4 |
=
| 1 |
| 4 |
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