102×98+4/252^2-248^2

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102×98+4/252^2-248^2
102×98+4/252^2-248^2

102×98+4/252^2-248^2
102×98+4/252^2-248^2
=(100+2)×98+4/(252-248)(252+248)
=100×98+2×98+4/(4×500)
=9800+196+4/2000
=9996+0.002
=9996.002

102×98+4/252^2-248^2
=(100+2)×98+4/(252-248)(252+248)
=100×98+2×98+4/(4×500)
=9800+196+4/2000
=9996+0.002
=9996.002

原式=[(100+2)*(100-2)+4]/[(252+248)(252-248)]
=(100²-2²+4)/(4*500)
=(9996+4)/2000
=10000/2000
=5