题目内容
| 脱式计算. 1-(
| (87-62)×280 | 7.87+(5-3.245) |
(1)1-(
-
),
=1-
,
=
;
(2)(87-62)×280,
=25×280,
=25×4×70,
=100×70,
=7000;
(3)7.87+(5-3.245),
=7.87+1.755,
=9.625.
| 7 |
| 9 |
| 5 |
| 9 |
=1-
| 2 |
| 9 |
=
| 7 |
| 9 |
(2)(87-62)×280,
=25×280,
=25×4×70,
=100×70,
=7000;
(3)7.87+(5-3.245),
=7.87+1.755,
=9.625.
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