问题描述:
几道小学六年级奥数题(简便运算)
1/1*3+1/3*5+1/5*7+……+1/47*49
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1/2*5+1/3*5+1/8*11+……+1/20*23
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3/4+7/12-9/20+11/30-13/42
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2002/1*3+2002/3*5+2002/5*7+2002/7*9+2002/9*11
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最好写上过程,解题思路.
1/1*3+1/3*5+1/5*7+……+1/47*49
=
=
1/2*5+1/3*5+1/8*11+……+1/20*23
=
=
3/4+7/12-9/20+11/30-13/42
=
=
2002/1*3+2002/3*5+2002/5*7+2002/7*9+2002/9*11
=
=
最好写上过程,解题思路.
问题解答:
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