题目内容
脱式计算.
| 285-(61+59) | 75×16-180 | 17×(253-186) |
(1)285-(61+59),
=285-120,
=165;
(2)75×16-180,
=1200-180,
=1020;
(3)17×(253-186),
=17×67,
=1139.
=285-120,
=165;
(2)75×16-180,
=1200-180,
=1020;
(3)17×(253-186),
=17×67,
=1139.
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