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

Toán Lớp 8: Phân tích thành nhân tử a. 10x-15y b.7x^2-14x+21 c.x^2-4x+4 d.(2x-1)^2-2(2x-1)(x+2)+(x+2)^2

Toán Lớp 8: Phân tích thành nhân tử
a. 10x-15y
b.7x^2-14x+21
c.x^2-4x+4
d.(2x-1)^2-2(2x-1)(x+2)+(x+2)^2

Comments ( 1 )

  1. a)
    10x – 15y
    = 5(2x – 3y)
    b)
    7x^2 – 14x + 21
    = 7(x^2 – 2x + 3)
    c)
    x^2 – 4x + 4
    = x^2 – 2 . x . 2 + 2^2
    = (x – 2)^2
    d)
    (2x-1)^2-2(2x-1)(x+2)+(x+2)^2
    = (2x – 1 – x – 2)^2
    = (x – 3)^2

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

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