题目内容
脱式计算(能简便计算的要简便计算)
3×(
|
(
|
75×
|
|
①3×(
-
)×5,
=3×
×5-3×
×5,
=5-3,
=2;
②(
+
)×
+3,
=
×
+3,
=
+3,
=3
;
③75×
+25×25%,
=75×0.25+25×0.25,
=(75+25)×0.25,
=100×0.25,
=25;
④
×15-
,
=
×(15-1),
=
×14,
=8.
| 1 |
| 3 |
| 1 |
| 5 |
=3×
| 1 |
| 3 |
| 1 |
| 5 |
=5-3,
=2;
②(
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 7 |
=
| 7 |
| 8 |
| 1 |
| 7 |
=
| 1 |
| 8 |
=3
| 1 |
| 8 |
③75×
| 1 |
| 4 |
=75×0.25+25×0.25,
=(75+25)×0.25,
=100×0.25,
=25;
④
| 4 |
| 7 |
| 4 |
| 7 |
=
| 4 |
| 7 |
=
| 4 |
| 7 |
=8.
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