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

Toán Lớp 8: Rút gọn biểu thức: a, `(x+3)^2 – 2x . (3x-2` b, `(3x-4y)^2 – (3x+4y) . (3x-4y)`

Toán Lớp 8: Rút gọn biểu thức:
a, (x+3)^2 – 2x . (3x-2
b, (3x-4y)^2 – (3x+4y) . (3x-4y)

Comments ( 2 )

  1. a, (x+3)²-2x.(3x-2)
    = x²+12x+9-6x²+4x
    = -5x²+16x+9
    b, (3x-4y)²-(3x+4y)(3x-4y)
    =9x²-24xy+16y²-9x²+16y²
    =32y²-24xy
    Cho mk xin hay nhất please
    Thank you

  2. a)
    $= x^2 + 6x + 9 – 6x^2 + 4x$
    $= -5x^2 + 10x+9$
    b)
    $= 9x^2 – 24xy + 16x^2 – 9x^2 + 16y^2$
    $= -24xy + 32y^2$

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

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