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

Toán Lớp 8: PTĐTTNT ạ a) 8xy^2 – 6x^2y b) x^2 – 10x + 25-y^2 c) x^2-3x – 10

Toán Lớp 8: PTĐTTNT ạ
a) 8xy^2 – 6x^2y
b) x^2 – 10x + 25-y^2
c) x^2-3x – 10

Comments ( 2 )

  1. text{@dg}
    text{a)}8xy^2-6x^2y
    =2xy(4y-3x)
    text{____}
    text{b)}x^2-10x+25-y^2
    =(x-5)^2-y^2
    =(x-5-y)(x-5+y)
    text{____}
    text{c)}x^2-3x-10
    =x^2+2x-5x-10
    =x(x+2)-5(x+2)
    =(x+2)(x-5)

  2. Giải đáp+Lời giải và giải thích chi tiết:
    a) 8xy^2-6x^2y
    =2xy .4y-2xy .3x
    =2xy (4y-3x)
    b) x^2-10x+25-y^2
    =(x^2-10x+25)-y^2
    =(x-5)^2-y^2
    =(x-5+y)(x-5-y)
    c) x^2-3x-10
    =x^2-5x+2x-10
    =x(x-5)+2(x-5)
    =(x+2)(x-5) 

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