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

Toán Lớp 8: C=2(3x+5)^2-2x(3x+1)(3x-1) rút gọn ạ cảm ơn ai lm đc

Toán Lớp 8: C=2(3x+5)^2-2x(3x+1)(3x-1)
rút gọn ạ cảm ơn ai lm đc

Comments ( 2 )

  1. #huy
    C=2(3x+5)^2-2x(3x+1)(3x-1)
    =18x^2+60x+50-18x^3+6x^2-6×62=2x
    =18x^2+62x+50-18x^2
     

  2. C=2(3x+5)^2-2x(3x+1)(3x-1)
    =18x^2+60x+50-18x^3+6x^2-6x^2+2x
    =18x^2+62x+50-18x^3
     

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