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

Toán Lớp 8: Giúp mk nhé nhiều câu hỏi khó. X^2-4x+12

Toán Lớp 8: Giúp mk nhé nhiều câu hỏi khó. X^2-4x+12

Comments ( 1 )

  1. $\#phnn$
    x^2-4x-12
    =x^2-2.x.2+2^2-2^2-12
    =(x-2)^2-16
    =(x-2)^2-4^2
    =(x-2-4)(x-2+4)
    =(x-6)(x+2)
     

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