题目内容
下面各题怎样简便就怎样算.
| 456+322+178 | (780-724)×15 | 973-245-255 | 1800-1800÷15. |
(1)456+322+178,
=456+(322+178),
=456+500,
=956;
(2)(780-724)×15,
=56×15,
=840;
(3)973-245-255,
=973-(245+255),
=973-500,
=473;
(4)1800-1800÷15,
=1800-120,
=1680.
=456+(322+178),
=456+500,
=956;
(2)(780-724)×15,
=56×15,
=840;
(3)973-245-255,
=973-(245+255),
=973-500,
=473;
(4)1800-1800÷15,
=1800-120,
=1680.
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