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

Toán Lớp 8: thực hiện phép tính a)3x(x ²+3x) -4x(x ²-2x) b)(x+2)(x ²+3x)+2x(x ²-5x) làm giúp mình đi nha

Toán Lớp 8: thực hiện phép tính
a)3x(x ²+3x) -4x(x ²-2x)
b)(x+2)(x ²+3x)+2x(x ²-5x)
làm giúp mình đi nha

Comments ( 2 )

  1. a,
    3x(x^2 +3x) -4x(x^2 -2x)
    =3x^3 +9x^2 -4x^3 +8x^2
    =-x^3 +17x^2
    b,
    (x+2)(x^2 +3x) +2x(x^2 -5x)
    =x^3 +2x^2 +3x^2 +6x +2x^3 -10x^2
    =3x^3 -5x^2 +6x

  2. Giải đáp:
    $a) 3x(x²+3x)-4x(x²-2x)$
    $=3????³+9????²−4????³+8????²$
    $=−????³+17????²$
    $b) (x+2)(x²+3x)+2x(x²-5x)$
    $=x³+3x²+2x²+6x+2x³-10x²$
    $=3x³-5x²+6x$
            Chúc bn hc tốt????
                  \text{#LinhSad}
     

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

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