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求高手。。
1个回答
展开全部
2△【(3+4)/(3x4)】=2△7/12=(2+7/12)/(2x7/12)=31/14
原式=1/2( 2/2*4+2/4*6+······+2/48*50 )
=1/2(1/2-1/4+1/4-1/6+······+1/48-1/50)=1/2(1/2-1/50)=6/25
原式=1/2( 2/2*4+2/4*6+······+2/48*50 )
=1/2(1/2-1/4+1/4-1/6+······+1/48-1/50)=1/2(1/2-1/50)=6/25
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