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

Toán Lớp 8: giúp mình bài này(x/2-y)(x/2+y)

Toán Lớp 8: giúp mình bài này(x/2-y)(x/2+y)

Comments ( 2 )

  1. #tnvt
    (x/2-y)(x/2+y)
    =(x/2)^2-y^2
    =\frac{x^2}{4}-y^2
     

  2. (x/2-y)(x/2+y)
    =(1/2x-y)(1/2x+y)
    =(1/2x)^2-y^2
    =1/4x^2-y^2
     

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