题目内容
| 57.5-4.25-15.75 | 125×32 |
| ||||||||||||
99×
| 0.76×0.25+
|
|
(1)57.5-4.25-15.75,
=57.5-(4.25+15.75),
=57.5-20,
=37.5;
(2)125×32,
=125×(8×4),
=125×8×4,
=1000×4,
=4000;
(3)
×16.31-
×2.31,
=
×(16.31-2.31),
=
×14,
=10;
(4)99×
,
=(98+1)×
,
=98×
+1×
,
=7+
,
=7
;
(5)0.76×0.25+
×0.24,
=0.76×0.25+0.25×0.24,
=0.25×(0.76+0.24),
=0.25×1,
=0.25;
(6)
×0.8+
×80%+
×
,
=
×0.8+
×0.8+0.8×
,
=(
+
+
)×0.8,
=1×0.8,
=0.8.
=57.5-(4.25+15.75),
=57.5-20,
=37.5;
(2)125×32,
=125×(8×4),
=125×8×4,
=1000×4,
=4000;
(3)
| 5 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
=10;
(4)99×
| 7 |
| 98 |
=(98+1)×
| 7 |
| 98 |
=98×
| 7 |
| 98 |
| 7 |
| 98 |
=7+
| 7 |
| 98 |
=7
| 7 |
| 98 |
(5)0.76×0.25+
| 1 |
| 4 |
=0.76×0.25+0.25×0.24,
=0.25×(0.76+0.24),
=0.25×1,
=0.25;
(6)
| 4 |
| 13 |
| 3 |
| 13 |
| 4 |
| 5 |
| 6 |
| 13 |
=
| 4 |
| 13 |
| 3 |
| 13 |
| 6 |
| 13 |
=(
| 4 |
| 13 |
| 3 |
| 13 |
| 6 |
| 13 |
=1×0.8,
=0.8.
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