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用简便方法计算58+135+65500-243-575600÷4÷25125×564800÷(16×15)81×65+81×35

题目详情
用简便方法计算
58+135+65             500-243-57                  5600÷4÷25
125×56               4800÷(16×15)81×65+81×35
▼优质解答
答案和解析
(1)58+135+65             
=58+(135+65)
=58+200
=258;

(2)500-243-57                               
=500-(243+57)
=500-300
=200;

(3)5600÷4÷25
=5600÷(4×25)
=5600÷100
=56;

(4)125×56               
=125×8×7
=1000×7
=7000;             

(5)4800÷(16×15)
=4800÷16÷15
=300÷15
=20;

(6)81×65+81×35
=81×(65+35)
=81×100
=8100.