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

Toán Lớp 8: Rút gọn biểu biểu: e, `(2x-3y) . (2x-3) – (2x+3)^2` g, `(3x-5) . (4x-2)`

Toán Lớp 8: Rút gọn biểu biểu:
e, (2x-3y) . (2x-3) – (2x+3)^2
g, (3x-5) . (4x-2)

Comments ( 2 )

  1. e, (2x-3y).(2x-3)-(2x+3)²
    =2x(2x-3)-3y(2x-3)-(4x²+12x+9)
    =4x²-6x-6xy+9y²-4x²-12x+9
    =-18x-6xy+9y²+9
    g, (3x-5).(4x-2)
    =3x(4x-2)-5.(4x-2)
    =12x²-6x-20x+10
    =12x²-26x+10
    Cho mk xin hay nhất please
    Thank you

  2. Giải đáp + giải thích các bước giải :  $\\$ e) (2x-3y)(2x-3) – (2x+3)^2 $\\$ = 4x^2 -6x – 6xy + 9y – 4x^2 – 12x – 9 $\\$ = -18x -6xy + 9y-9  f) (3x-5)(4x-2) $\\$ = 12x^2 – 6x – 20x + 10 $\\$ = 12x^2 – 26x + 10
     

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

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