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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: (x+y)2-(x-y)2/(y+z)2-(y-z)2=2x/y

Toán Lớp 8: (x+y)2-(x-y)2/(y+z)2-(y-z)2=2x/y

Comments ( 1 )

  1. [(x+y)^2-(x-y)^2]/[(y+z)^2-(y-z)^2]=2x/y
    [(x+y-x+y)(x+y+x-y)]/[(y+z-y+z)(y+z+y-z)]=2x/y
    (2y.2x)/(2z.2y)=2x/y
    x/z=2x/y
    xy=2xz
    Cho mk xin hay nhất please
    Thank you

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222-9+11+12:2*14+14 = ? ( )

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