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

Toán Lớp 8: x^2-2xy+y^2 (giup mik voi )

Toán Lớp 8: x^2-2xy+y^2 (giup mik voi )

Comments ( 2 )

  1. $= (x-y)^2$
    Hằng đẳng thức thứ 2

  2. $x^2-2xy+y^2$
    $=x^2-xy-xy+y^2$
    $=x(x-y)-y(x-y)$
    $=(x-y)(x-y)$
    $=(x-y)^2$

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