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

Toán Lớp 8: Khai trien hang dang thuc sau a)(2x-3y)^2 b)(x-3).(x+3) c)(x-1/3)^3 d)8+x^3 e)16x^2-9y^2

Toán Lớp 8: Khai trien hang dang thuc sau
a)(2x-3y)^2
b)(x-3).(x+3)
c)(x-1/3)^3
d)8+x^3
e)16x^2-9y^2

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     a) (2x-3y)²
    = (2x)²-2.2x.3y+(3y)²
    = 4x²-12xy+9y²
    b) (x-3)(x+3)
    = x²-3²
    = x²-9
    c) (x-1/3)^3
    = x³-3.x². 1/3+3.x.(1/3)^2 – (1/3)^2
    = x³-x²+1/3 x-1/27
    d) 8+x³
    = 2³+x³
    = (2+x)(2²-2.x+x²)
    =(2+x)(4-2x+x²)
    e) 16x²-9y²
    = (4x)²-(3y)²
    = (4x-3y)(4x+3y)

  2. #tnvt
    a)(2x-3y)^2
    =4x^2-12x+9y^2
    b)(x-3)(x+3)
    =x^2-9
    c)(x-1/3)^3
    =x^3-x^2+1/3x-1/27
    d)8+x^3
    =(2+x)(4-2x+x^2)
    e)16x^2-9y^2
    =(4x-3y)(4x+3y)

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

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