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

Toán Lớp 8: phan tich thanh nhan tu (5x-10)(x^2-1)-(3x-6)(x^2-2x+1)

Toán Lớp 8: phan tich thanh nhan tu (5x-10)(x^2-1)-(3x-6)(x^2-2x+1)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (5x-10)(x^2-1)-(3x-6)(x^2-2x+1)
    =5(x-2)(x-1)(x+1)-3(x-2)(x-1)^2
    =(x-2)(x-1)[5(x+1)-3(x-1)]
    =(x-2)(x-1)(5x+5-3x+3)
    =(x-2)(x-1)(2x+8)
    =2(x-2)(x-1)(x+4)

  2. ~ Bạn tham khảo ~
    (5x-10)(x^2-1)-(3x-6)(x^2-2x+1)
    = (5x-10)(x-1)(x+1)-(3x-6)(x-1)^2
    = (x-1)[(5x-10)(x+1)-(3x-6)(x-1)]
    = (x-1)[5(x-2)(x+1)-3(x-2)(x-1)]
    = (x-1)(x-2)[5(x+1)-3(x-1)]
    = (x-1)(x-2)(5x+5-3x+3)
    = (x-1)(x-2)(2x+8)
    = 2(x-1)(x-2)(x+4)

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