一:x(x+Y)-6y+x+13y-6二:x(x+Y)-6y-x+7y-2三:6x^2-7xy-3y^2-x-2四:n(n+1)(n+2)(n+3)+1五6x^3+11x^-5x-12
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一:x(x+Y)-6y+x+13y-6二:x(x+Y)-6y-x+7y-2三:6x^2-7xy-3y^2-x-2四:n(n+1)(n+2)(n+3)+1五6x^3+11x^-5x-12
一:x(x+Y)-6y+x+13y-6
二:x(x+Y)-6y-x+7y-2
三:6x^2-7xy-3y^2-x-2
四:n(n+1)(n+2)(n+3)+1
五6x^3+11x^-5x-12
一:x(x+Y)-6y+x+13y-6二:x(x+Y)-6y-x+7y-2三:6x^2-7xy-3y^2-x-2四:n(n+1)(n+2)(n+3)+1五6x^3+11x^-5x-12
四:
n(n+1)(n+2)(n+3)+1
=n(n+3)(n+1)(n+2)+1
=(n^2+3n)(n^2+3n+2)+1
=(n^2+3n)^2+2(n^2+3n)+1
=(n^2+3n+1)^2
五:
6x^3+11x^-5x-12
=(x-1)(6x^2+17x+12)
=(x-1)(2x+3)(3x+4)
五: 先看出一个根x=1. 所以:6x^3+11x^2-5x-12 = (x-1)(6x^2+17x+12)=(x-1)(2x+3)(3x+4)
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