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第十六题,帮忙啦!
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3.48^2-4*1.24^2
=3.48^2-(2*1.24)^2
=(3.48+2.48)(3.48-2.48)
=5.96
(91^2-31^2)/(151^2-91^2)
=((91+31)(91-31))/((151+91)(151-91))
=122*60/(242*60)
=61/121
=3.48^2-(2*1.24)^2
=(3.48+2.48)(3.48-2.48)
=5.96
(91^2-31^2)/(151^2-91^2)
=((91+31)(91-31))/((151+91)(151-91))
=122*60/(242*60)
=61/121
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