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116问答网 > 2*4分之3平方+4*6分之5平方+6*8分之7平方+8*10分之9平方+10*12分之11平方

24分之3平方+46分之5平方+68分之7平方+810分之9平方+10*12分之11平方

过程+答案高手快来，在线等~

2025-04-03 11:39:46

推荐回答（1个）

回答1：

2*（3/4)^2+4*(5/6)^2+6*(7/8)^2+8*(9/10)^2+10*(11/12)^2
=[9/4+25/6+49/8+81/10+121/12]/
=(2+4+6+8+10）/3+(1/4+1/6+1/8+1/10+1/12)/3
=10+(30+20+15+12+10)/360
=10+87/360
=10+29/120

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