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

Toán Lớp 8: Rút gọn biểu thức a)3x( 5x² – 2x – 1) + x( x – 1) b)(x² + x – 10 )(x – 2) c)3x(x – 4) + ( 5 +x)(2 – 3x) d) (x

Toán Lớp 8: Rút gọn biểu thức
a)3x( 5x² – 2x – 1) + x( x – 1)
b)(x² + x – 10 )(x – 2)
c)3x(x – 4) + ( 5 +x)(2 – 3x)
d) (x – y)² + ( x + y)² – 2y²

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a) 3x(5x²-2x-1)+x(x-1)
    =15x³-6x²-3x+x²-x
    =15x³-5x²-4x
    b) (x²+x-10)(x-2)
    =x³-2x²+x²-2x-10x+20
    =x³-x²-12x+20
    c) 3x(x-4)+(5+x)(2-3x)
    =3x²-12x+10-15x+2x-3x²
    =-25x+10
    d) (x-y)²+(x+y)²-2y²
    =x²-2xy+y²+x²+2xy+y²-2y²
    =2x²
          Chúc bn hc tốt????
               $\text{#LinhSad}$

  2. a)
    $= 15x^3 – 6x^2 – 3x + x^2 – x$
    $= 15x^3 – 5x^2 – 4x$
    b)
    $= x^3 – 2x^2 + x^2 – 2x – 10x + 20$
    $= x^3 – x^2 – 12x + 20$
    c)
    $= 3x^2 – 12x + 10 – 15x + 2x – 3x^2$
    $= -25x + 10$
    $= 10 – 25x$
    d)
    $= x^2 – 2xy + y^2 + x^2 + 2xy + y^2 – 2y^2$
    $= 2x^2$

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