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

Toán Lớp 8: a)3x^2-2x^2 b)x^2-y^2+2x+2y giúp tớ với

Toán Lớp 8: a)3x^2-2x^2 b)x^2-y^2+2x+2y giúp tớ với

Comments ( 2 )

  1. a) 3x²-2x²
    = x²(3-2)=x²
    b) x²-y²+2x+2y
    =x²+2x+1-y²+2y-1
    =  x² +2x+1-(y²-2y+1)
    = (x+1)²-(y-1)²
    =(x+y)(x-y-2)

  2. a)3x^2-2x^2
    =x^2
    b)x^2-y^2+2x+2y
    =(x^2-y^2)+(2x+2y)
    =(x+y).(x-y)+2.(x+y)
    =(x+y).(x-y+2)
     

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