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

Toán Lớp 8: a, $5x$ ( $4x^{2}$ + $3$ – $2x$ ) b, ( $x$ – $2$ ) ( $5$ – $2x^{2}$ + $2x$ ) đề : Tính

Toán Lớp 8: a, $5x$ ( $4x^{2}$ + $3$ – $2x$ )
b, ( $x$ – $2$ ) ( $5$ – $2x^{2}$ + $2x$ )
đề : Tính

Comments ( 2 )

  1. a)5x(4x²+3-2x)
    =20x³+15x-10x²
    b)(x-2)(5-2x²+2x)
    =5x-2x³+2x²-(10-4x²+4x)
    =5x-2x³+2x²-10+4x²-4x
    =x-2x³+6x²-10
     

  2. a,
    5x(4x^2 + 3 -2x)
    = 20x^3 + 15x – 10x^2
    b,
    (x-2)(5-2x^2+2x)
    =x(5-2x^2+2x) – 2(5-2x^2+2x)
    =5x-2x^3+2x^2-10+4x^2-4x
    =-2x^3 +(2x^2+4x^2) + (5x-4x) – 10
    =-2x^3 + 6x^2 + x -10

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