Question

计算:(-2a^2b)(2/3ab^3)(-6b^2c^3) (x+y)(x-y)-(x-2y)(x+2y) (3x-2

Answer 1

(-2a^2b)(2/3ab^3)(-6b^2c^3)

=8a³b的6次方c³

(x+y)(x-y)-(x-2y)(x+2y)

=x²-y²-x²+4y²

=3y²

(3x-2y)^2-(3x-y)(3x+y)

=9x²-12xy+4y²-9x²+y²

=5y²-12xy

(x+1)(x-1)(x^2-1)-(x^2+1)^2

=(x²-1)(x²-1)-(x²+1)²

=x^4-2x²+1-x^4-2x²-1

=-4x²

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