因式分解 x⁴-2x²y-3y²+6y-4应为x⁴-2x²y-3y²+8y-4

因式分解 x⁴-2x²y-3y²+6y-4
应为x⁴-2x²y-3y²+8y-4

原式=x^4-2x²y+y²-4y²+8y-4
=(x²-y)²-4(y-1)²
=(x²-y+2y-2)(x²-y-2y+2)
=(x²+y-2)(x²-3y+2)

• 推荐答案不对

• 血魅陌是对滴

• 就是先加一个y²和前面配成个(a-b)²   再减去个y²和后面配个(c-d)²   得(a-b)²-(c-d)²即可分解