因式分解(x-3y)^4+x^2-6xy+9y^2-2答案不要有中括号,
问题描述:
因式分解(x-3y)^4+x^2-6xy+9y^2-2
答案不要有中括号,
答
(x-3y)^4+x^2-6xy+9y^2-2
=(x-3y)^4+(x-3y)^2-2
=[(x-3y)^2-1][(x-3y)^2+2]
=(x-3y+1)(x-3y-1)(x^2-6xy+9y^2+2)
答
原式=(x-3y)^4+x^2-2*x*3y+(3y)^2-2 =(x-3y)^4+(x-3y)^2-2 =(x-3y)^4+2*1/2*(x-3y)^2+(1/2)^2-(1/2)^2-2 =[(x-3y)+1/2]^2-9/4 =(x-3y+1/2)^2-9/4=(x-3y+1/2+3/2)(x-3y+1/2-3/2)=(x-3y+2)(x-3y-1)