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

Toán Lớp 8: Phân tích đa thức thành nhân tử 1/x^2-x 2/10a(a-b)-8b(b-a) 3/x^2-3

Toán Lớp 8: Phân tích đa thức thành nhân tử
1/x^2-x
2/10a(a-b)-8b(b-a)
3/x^2-3

Comments ( 2 )

  1. 1) x² – x = x(x – 1)
    2) 10a(a – b) – 8b(b – a)
    =10a(a – b) + 8b(a – b)
    =(a – b)(10a + 8b)
    =2(a – b)(5a + 4b)
    3) x² – 3 = (x – √3)(x + √3)

  2. 1. x² – x
    = x(x – 1)
    ___________________________________
    2. 10a(a – b) – 8b(b – a)
    = 10a(a – b) + 8b(a – b)
    = (10a + 8b)(a – b)
    ___________________________________
    3. x² – 3
    = x² – (\sqrt{3})² 
    = (x – \sqrt{3})(x + \sqrt{3})

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