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

Toán Lớp 8: 1/(x+2)(2-x) 2/9x^2-16=… 3/(3x-5)(x+2)

Toán Lớp 8: 1/(x+2)(2-x)
2/9x^2-16=…
3/(3x-5)(x+2)

Comments ( 2 )

  1. 1,
    (x+2)(2-x)
    =(2+x)(2-x)
    =2^2-x^2
    =4-x^2
    2,
    9x^2-16
    =(3x)^2-4^2
    =(3x-4)(3x+4)
    3,
    (3x-5)(x+2)
    =3x.(x+2)-5.(x+2)
    =3x^2+6x-5x-10
    =3x^2+x-10

  2. 1,(x+2)(2-x)=2^2-x^2
                      =4-x^2
    2, 9x^2-16=(3x)^2 – 4^2=(3x-4)(3x+4)
    3, (3x-5)(x+2)= 3x^2 +6x-5x-10
                          = 3x^2 +x-10

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