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

Toán Lớp 8: PTĐTTNT: a. 5x^2y+40y b. x^2-9x+14

Toán Lớp 8: PTĐTTNT: a. 5x^2y+40y
b. x^2-9x+14

Comments ( 2 )

  1. a)5x^2y+40y
    =5y.x^2+5y.8
    =5y(x^2+8)
    b)x^2-9x+14
    =x^2-2x-7x+14
    =(x^2-2x)-(7x-14)
    =x(x-2)-7(x-2)
    =(x-7)(x-2)

  2. a, 5x^2 y + 40y
    = 5y( x^2 + 8)
    b, x^2 – 9x + 14
    =x^2 – 2x – 7x + 14
    = x( x-2) -7( x-2)
    =(x-2)(x-7)

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