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

Toán Lớp 8: Ptich đttnt a. x^2 – 9 +( x-3)^2 b. ( x^2 +2x) ( x^2 + 4x+3) -24

Toán Lớp 8: Ptich đttnt
a. x^2 – 9 +( x-3)^2
b. ( x^2 +2x) ( x^2 + 4x+3) -24

Comments ( 2 )

  1. Giải đáp:
     a) 2x(x-3)
    b) (x^2+3x+6)(x^2+3x-4)
    Lời giải và giải thích chi tiết:
    a) (x^2-9)+(x-3)^2
    =(x-3)(x+3)+(x-3)^2
    =(x-3)(x+3+x-3)
    =2x(x-3)
    b) (x^2+2x)(x^2+4x+3)-24
    =x(x+2)[(x^2+x)+(3x+3)]-24
    =x(x+2)(x+1)(x+3)-24
    =(x^2+3x)(x^2+3x+2)-24
    =(x^2+3x)^2+2(x^2+3x)+1-25
    =(x^2+3x+1)^2-5^2
    =(x^2+3x+6)(x^2+3x-4)

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