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简便运算:(1)4又5/6+49又2/3+499又1/2(2)2008又1/2006乘以2006/2007(3)2222乘以29/100-3333乘以1/25+6666乘以9/100(4)486+2007乘以756/2008乘以756-270-2006/2007
题目详情
简便运算:(1)4又5/6+49又2/3+499又1/2
(2)2008又1/2006乘以2006/2007
(3)2222乘以29/100-3333乘以1/25+6666乘以9/100
(4)486+2007乘以756/2008乘以756-270-2006/2007
(2)2008又1/2006乘以2006/2007
(3)2222乘以29/100-3333乘以1/25+6666乘以9/100
(4)486+2007乘以756/2008乘以756-270-2006/2007
▼优质解答
答案和解析
1)4又5/6+49又2/3+499又1/2
=(5-1/6)+(50-1/3)+(500-1/2)
=(5+50+500)-(1/6+1/3+1/2)
=555-1
=554
2)2008又1/2006乘以2006/2007
=(2008+1/2006)*(2006/2007)
=2008*2006/2007+1/2007
=(2007+1)(2007-1)/2007+1/2007
=(2007^2-1)/2007+1/2007
=2007^2/2007
=2007
3)2222乘以29/100-3333乘以1/25+6666乘以9/100
=1111*(2*29/100-3*1/25+6*9/100)
=1111*(58-12+54)/100
=1111
4)486+2007乘以756/2008乘以756-270-2006/2007
没看懂,你打上括号,否则就得按先乘除后加减了.
=(5-1/6)+(50-1/3)+(500-1/2)
=(5+50+500)-(1/6+1/3+1/2)
=555-1
=554
2)2008又1/2006乘以2006/2007
=(2008+1/2006)*(2006/2007)
=2008*2006/2007+1/2007
=(2007+1)(2007-1)/2007+1/2007
=(2007^2-1)/2007+1/2007
=2007^2/2007
=2007
3)2222乘以29/100-3333乘以1/25+6666乘以9/100
=1111*(2*29/100-3*1/25+6*9/100)
=1111*(58-12+54)/100
=1111
4)486+2007乘以756/2008乘以756-270-2006/2007
没看懂,你打上括号,否则就得按先乘除后加减了.
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