1/1×4+1/4×7+1/7×10+1/10×13+1/13×16=???????急啊 !!!!!!!!!!!!!!!!!!!!
1/1×4+1/4×7+1/7×10+1/10×13+1/13×16=???????急啊!!!!!!!!!!!!!!!!!!!!请把过程写清楚!...
1/1×4+1/4×7+1/7×10+1/10×13+1/13×16=???????急啊 !!!!!!!!!!!!!!!!!!!!
请把过程写清楚! 展开
请把过程写清楚! 展开
4个回答
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1/1*4+1/4*7+1/7*10+1/10*13+1/13*16
=1/3*(1-1/4)+1/3*(1/4-1/7)+1/3*(1/7-1/10)+1/3*(1/10-1/13)+1/3*(1/13-1/16)
=1/3*(1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16)
=1/3*(1-1/16)
=1/3*15/16
=5/16
=1/3*(1-1/4)+1/3*(1/4-1/7)+1/3*(1/7-1/10)+1/3*(1/10-1/13)+1/3*(1/13-1/16)
=1/3*(1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16)
=1/3*(1-1/16)
=1/3*15/16
=5/16
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展开全部
1/1×4+1/4×7+1/7×10+1/10×13+1/13×16
=1/3*(1-1/4+1/4-1/7+.....+1/13-1/16)
=5/16
=1/3*(1-1/4+1/4-1/7+.....+1/13-1/16)
=5/16
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