(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
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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)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)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(x^2+3xy-5y)
(2)4x^3-12x^2-18x
=2x(2x²-6x-9)
(3)-7ab-14abx+49aby
=-7ab(1+2x-7y)
(4)5x(a+b-c)-10y(a+b-c)
=5(x-2y)(a+b-c)
(5)πR^2-4πr^2
=π(R^2-4r^2)
=π(R+2r)(R-2r)
以后不要一次发很多问题,这样答得人少,你一道一道的发,会很快有人回复的.
如果本题有什么不明白可以追问,
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