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简便运算(1)425+636+575+214(2)125×3×80(3)5×44×25(4)123×67-123+123×34.

题目详情
简便运算
(1)425+636+575+214          
(2)125×3×80
(3)5×44×25          
(4)123×67-123+123×34.




▼优质解答
答案和解析
(1)425+636+575+214,
=(425+575)+(636+214),
=1000+850,
=1850;
   
(2)125×3×80,
=125×80×3,
=10000×3,
=30000;

(3)5×44×25,
=(5×11)×(4×25),
=55×100,
=5500;
          
(4)123×67-123+123×34,
=123×(67-1+34),
=123×100,
=12300.