题目内容
| 用简便方法计算下面各题 687-298 |
348+(417+152) | 867-457-243 |
| 587-378+113 | 375+103 | 487-(187+37) |
(1)687-298,
=687-300+2,
=389;
(2)348+(417+152),
=348+152+417,
=500+417,
=917;
(3)867-457-243,
=867-(457+243),
=867-700,
=167;
(4)587-378+113,
=587+113-378,
=700-378,
=322;
(5)375+103,
=375+100+3,
=478;
(6)487-(187+37),
=487-187-37,
=300-37,
=263.
=687-300+2,
=389;
(2)348+(417+152),
=348+152+417,
=500+417,
=917;
(3)867-457-243,
=867-(457+243),
=867-700,
=167;
(4)587-378+113,
=587+113-378,
=700-378,
=322;
(5)375+103,
=375+100+3,
=478;
(6)487-(187+37),
=487-187-37,
=300-37,
=263.
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