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

Toán Lớp 8: a) 12x² – 18x²y b) 16x² – y² c) 16-x² – 8y + y² d) x⁴ – 64x

Toán Lớp 8: a) 12x² – 18x²y
b) 16x² – y²
c) 16-x² – 8y + y²
d) x⁴ – 64x

Comments ( 2 )

  1. Giải đáp +Lời giải và giải thích chi tiết:
     a) 12x^2 – 18x^2y
    = 6x^2( 2 – 3y )
    b) 16x^2 – y^2
    = (4x)^2 – y^2
    = (4x – y )(4x + y )
    c) 16 – x^2 – 8y + y^2
    = (y^2 – 8y + 16) – x^2
    = (y – 4)^2 – x^2
    = (y – 4 – x)(y – 4 + x)
    d) x^4 – 64x
    = x( x^3 – 4^3)
    = x(x – 4)(x^2 + 4x + 16)

  2. a)12x² – 18x²y
    =6x²(2 – 3y)
    b)16x² – y²
    =(4x-y)(4x+y)
    c)16-x² – 8y + y²
    =y² – 8y + 16 – x²
    =(y-4)² – x²
    =(y-4-x)(y-4+x)
    d)x^4 – 64x
    =x(x³ – 64)
    =x(x³ – 4³)
    =x(x-4)(x² + 4x + 16)

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