a²-4a+4-c²3x²y+28y²+7xy²+12xya四次方-3a²-46x²-17x-105x²-13xy-6y

题目

a²-4a+4-c²

3x²y+28y²+7xy²+12xy

a四次方-3a²-4

6x²-17x-10

5x²-13xy-6y²

6﹙m-n﹚ ²-10m+10n-4

x³-2x ²+xy²-x

x²+xy-2y²

3y^n-1-6y^n-2-9y^n-3

答案

a²-4a+4-c²=(a-2)^2-c^2=(a-2+c)(a-2-c)3x²y+28y²+7xy²+12xy=y(3x^2+12x+28y+7xy)=y(3x(x+4)+7y(x+4))=y(x+4)(3x+7y)a四次方-3a²-4=(a^2-4)(a^2+1)=(a+2)(a-2)(a^2+1)6x²-17x-10...