用十字相乘法做:(1)x^2-3xy+2y^2 (2)x^4-3x^3-28x^2 (3)a^2-9ab+14b^2 (4)x^2·y^2-5x^2y-6x^2(5)-a^3-4a^2+12a (6)x^2+11xy+18y^2 过程要精细,要让我看得懂 ,越快越好!回答的满意,

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/28 00:18:13
用十字相乘法做:(1)x^2-3xy+2y^2(2)x^4-3x^3-28x^2(3)a^2-9ab+14b^2(4)x^2·y^2-5x^2y-6x^2(5)-a^3-4a^2+12a(6)x^2+

用十字相乘法做:(1)x^2-3xy+2y^2 (2)x^4-3x^3-28x^2 (3)a^2-9ab+14b^2 (4)x^2·y^2-5x^2y-6x^2(5)-a^3-4a^2+12a (6)x^2+11xy+18y^2 过程要精细,要让我看得懂 ,越快越好!回答的满意,
用十字相乘法做:(1)x^2-3xy+2y^2 (2)x^4-3x^3-28x^2 (3)a^2-9ab+14b^2 (4)x^2·y^2-5x^2y-6x^2
(5)-a^3-4a^2+12a (6)x^2+11xy+18y^2 过程要精细,要让我看得懂 ,越快越好!回答的满意,

用十字相乘法做:(1)x^2-3xy+2y^2 (2)x^4-3x^3-28x^2 (3)a^2-9ab+14b^2 (4)x^2·y^2-5x^2y-6x^2(5)-a^3-4a^2+12a (6)x^2+11xy+18y^2 过程要精细,要让我看得懂 ,越快越好!回答的满意,
你好,506604433:
(1)x²-3xy+2y²
=(x-2y)(x-y)
(2)x⁴-3x³-28x²
=x²(x²-3x-28)
=x²(x-7)(x+4)
(3)a²-9ab+14b²
=(a-2b)(a-7b)
(4)x²y²-5x²y-6x²
=x²(y²-5y-6)
=x²(y-6)(y+1)
(5)-a³-4a²+12a
=a(-a²-4a+12)
=a(2-a)(a+6)
(6)x²+11xy+18y²
=(x+9y)(x+2y)