计算: 1/1×5+1/5×9+1/9×13+1/13×17+1/17×21+1/21×25 456+979×455/456×979—523
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1/1×5+1/5×9+1/9×13+1/13×17+1/17×21+1/21×25
=(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21+1/12-1/25)÷4
=(1-1/25)÷4
=24/25÷4
=6/25
(456+979×455)/(456×979—523)
=( 456+979×455)/(455×979+979—523 )
=(456+979×455)/(455×979+456)
=1
=(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21+1/12-1/25)÷4
=(1-1/25)÷4
=24/25÷4
=6/25
(456+979×455)/(456×979—523)
=( 456+979×455)/(455×979+979—523 )
=(456+979×455)/(455×979+456)
=1
2011-12-23
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正确啊!!!!!
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