(1)2x^2+6xy-10y (2)4x^3-12x^2-18x (3)-7ab-14abx+49aby (4)5x(
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(1)2x^2+6xy-10y (2)4x^3-12x^2-18x (3)-7ab-14abx+49aby (4)5x(a+b-c)-10y(a+b-c) (5)πR^2-4πr^2
(1)2x^2+6xy-10y
=2(x²+3xy-5y)
(2)4x^3-12x^2-18x
=2x(x²-6x-9)
(3)-7ab-14abx+49aby
=-7ab(1+2x-7y)
(4)5x(a+b-c)-10y(a+b-c)
=5(a+b-c)(x-2y)
(5)πR^2-4πr^2
=π(R²-4r²)
=π(R+2r)(R-2r)
=2(x²+3xy-5y)
(2)4x^3-12x^2-18x
=2x(x²-6x-9)
(3)-7ab-14abx+49aby
=-7ab(1+2x-7y)
(4)5x(a+b-c)-10y(a+b-c)
=5(a+b-c)(x-2y)
(5)πR^2-4πr^2
=π(R²-4r²)
=π(R+2r)(R-2r)
12x²+4x-1 x²-(a+b)xy+aby² xy-1+x-y x²-(2
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