a)x^3-2x^2y+xy^2-9x b) (x+y)^2-(x-y)^2 c) (3x+1)^2-(x+1)^2 d) 25^2-15^2 e) x^2-x-y^2-y h) x^2-2xy+y^2-z^2 g) 5x-5y+ax-ay m) a^3-a^3x-ay+xy

Bởi

a)x^3-2x^2y+xy^2-9x
b) (x+y)^2-(x-y)^2
c) (3x+1)^2-(x+1)^2
d) 25^2-15^2
e) x^2-x-y^2-y
h) x^2-2xy+y^2-z^2
g) 5x-5y+ax-ay
m) a^3-a^3x-ay+xy

0 bình luận về “a)x^3-2x^2y+xy^2-9x b) (x+y)^2-(x-y)^2 c) (3x+1)^2-(x+1)^2 d) 25^2-15^2 e) x^2-x-y^2-y h) x^2-2xy+y^2-z^2 g) 5x-5y+ax-ay m) a^3-a^3x-ay+xy”

  2. `a)x³-2x²y+xy²-9x`

    `=x(x²-2xy+y²-9)`

    `=x[(x²-2xy+y²)-9]`

    `=x[(x-y)²-3²]`

    `=x(x-y+3)(x-y-3)`

    `b)(x+y)²-(x-y)²`

    `=(x+y+x-y)(x+y-x+y)`

    `=2x.2y`

    `=4xy`

    `c)(3x+1)²-(x+1)²`

    `=(3x+1+x+1)(3x+1-x-1)`

    `=2x(4x+2)`

    `=4x(2x+1)`

    `d)25²-15²`

    `=(25+15)(25-15)`

    `=40.10`

    `=400`

    `e)x²-x-y²-y`

    `=(x²-y²)-(x+y)`

    `=(x+y)(x-y)-(x+y)`

    `=(x+y)(x-y-1)`

    `h)x²-2xy+y²-z²`

    `=(x²-2xy+y²)-z²`

    `=(x-y)²-z²`

    `=(x-y+z)(x-y-z)`

    `g)5x-5y+ax-ay`

    `=(5x-5y)+(ax-ay)`

    `=5(x-y)+a(x-y)`

    `=(x-y)(5+a)`

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