四项因式分解的题.a^2-ab+ac-bc,x^2+ax^2+x+ax-1-a,ac^2+bd^2-ad^2-bc^2,x^2-y^2+ax+ay,x^2-x-9y^2-3y,a^2-b^2+4b-4,a^2-2ab+b^2-c^2,x^2-y^2-z^2+2yz9-4a^2-4ab-b^2 -1-2x-x^2+y^2
问题描述:
四项因式分解的题.
a^2-ab+ac-bc,x^2+ax^2+x+ax-1-a,ac^2+bd^2-ad^2-bc^2,x^2-y^2+ax+ay,
x^2-x-9y^2-3y,a^2-b^2+4b-4,a^2-2ab+b^2-c^2,x^2-y^2-z^2+2yz
9-4a^2-4ab-b^2 -1-2x-x^2+y^2
答
a^2-ab+ac-bc=(a^2+ac)-(ab+bc)=a(a+c)-b(a+c)=(a-b)(a+c)x^2+ax^2+x+ax-1-a=x^2(a+1)+x(a+1)-(a+1)=(a^2+x-1)(a+1)ac^2+bd^2-ad^2-bc^2=(a-b)c^2-(a-b)d^2=(a-b)(c^2-d^2)=(a-b)(c-d)(c+d)x^2-y^2+ax+ay=(x+y)(x-y)...