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

Toán Lớp 8: rút gọn biểu thức 2x^2(3x^2-7x-3) 2(x+2)(x-2)+(x+3)(2x-1)

Toán Lớp 8: rút gọn biểu thức
2x^2(3x^2-7x-3)
2(x+2)(x-2)+(x+3)(2x-1)

Comments ( 2 )

  1. #tnvt
    2x^2(3x^2-7x-3)
    =6x^4-14x^3-6x^2
    $\\$
    2(x+2)(x-2)+(x+3)(2x-1)
    =2(x^2-4)+2x^2-x+6x-3
    =2x^2-8+2x^2+5x-3
    =4x^2+5x-11

  2. a) 2x²(3x²-7x-3)
    = 6$x^{4}$ -14x³-6x²
    b) 2(x+2)(x-2)+(x+3)(2x-1)
    = 2(x²-4)+(2x²+6x-x-3)
    = 2x²-8+2x²+6x-x-3
    = 4x²+5x-11

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