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用简便方法计算574+498487-305395-395733+260+67998+98+82596-68-432786-299-98237-196+63-4.

题目详情
用简便方法计算
574+498 487-305 395-395 733+260+67
998+98+8 2596-68-432 786-299-98 237-196+63-4.
574+498 487-305 395-395 733+260+67
998+98+8 2596-68-432 786-299-98 237-196+63-4.
574+498 487-305 395-395 733+260+67574+498487-305395-395733+260+67 998+98+8 2596-68-432 786-299-98 237-196+63-4.998+98+82596-68-432786-299-98237-196+63-4.
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答案和解析
(1)574+498,
=574+(500-2),
=574+500-2,
=1074-2,
=1072;

(2)487-305,
=487-(300+5),
=487-300-5,
=187-5,
=182;

(3)395-395=0;

(4)733+260+67,
=733+67+260,
=800+260,
=1060;

(5)998+98+8,
=(1000-2)+(100-2)+(10-2),
=(1000+100+10)-(2+2+2),
=1110-6,
=1104;

(6)2596-68-432,
=2596-(68+432),
=2596-500,
=2096;

(7)786-299-98,
=786-(300-1)-(100-2),
=786-300+1-100+2,
=(786-300-100)+(1+2),
=386+3,
=389;

(8)237-196+63-4,
=(237+64)-(196+4),
=300-200,
=100.