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用简便方法计算下面各题234+200+80026+(59+74)350+195+105+850147+89+53+11724+435+565+107611+13+25+25+29432-123-77721-303900-405827-506438-(138+189)435-49-11-40978-452-348.

题目详情
用简便方法计算下面各题
234+200+800
26+(59+74)
350+195+105+850
147+89+53+11
724+435+565+1076
11+13+25+25+29
432-123-77
721-303
900-405
827-506
438-(138+189)
435-49-11-40
978-452-348.













▼优质解答
答案和解析
(1)234+200+800
=234+(200+800)
=234+1000
=1234

(2)26+(59+74)
=(26+74)+59
=100+59
=159

(3)350+195+105+850
=(350+850)+(195+105)
=1200+300
=1500

(4)147+89+53+11
=(147+53)+(89+11)
=200+100
=300

(5)724+435+565+1076
=(724+1076)+(435+565)
=1800+1000
=2800

(6)11+13+25+25+29
=(11+29)+13+(25+25)
=40+50+13
=103

(7)432-123-77
=432-(123+77)
=432-200
=232

(8)721-303
=721-(300+3)
=721-300-3
=421-3
=418

(9)900-405
=900-(400+5)
=900-400-5
=500-5
=495

(10)827-506
=827-(500+6)
=827-500-6
=327-6
=321

(11)438-(138+189)
=438-138-189
=300-189
=111

(12)435-49-11-40
=435-(49+11+40)
=435-100
=335

(13)978-452-348
=978-(452+348)
=978-800
=178