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,
人气:195 ℃ 时间:2019-10-23 04:03:01
解答
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=x&su...我能不能再问几个问题?嘿嘿。。(1)x^6+8x^3+15(2)x^2-7xy+12y^2(3)a^2+2ab-15b^2(4)m^2+4mn-12n^2(5)p^2+9pq+18q^2
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