用十字相乘法分解因式:a^2b^2+16ab+39(2)15x^2n+7x^ny^n+1-4y2n+2(3)(x^2+3x)^2-22(x^2+3x)+72
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![用十字相乘法分解因式:a^2b^2+16ab+39(2)15x^2n+7x^ny^n+1-4y2n+2(3)(x^2+3x)^2-22(x^2+3x)+72](/uploads/image/z/15253600-40-0.jpg?t=%E7%94%A8%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%3Aa%5E2b%5E2%2B16ab%2B39%EF%BC%882%EF%BC%8915x%5E2n%2B7x%5Eny%5En%2B1-4y2n%2B2%EF%BC%883%EF%BC%89%EF%BC%88x%5E2%2B3x%EF%BC%89%5E2-22%EF%BC%88x%5E2%2B3x%EF%BC%89%2B72)
用十字相乘法分解因式:a^2b^2+16ab+39(2)15x^2n+7x^ny^n+1-4y2n+2(3)(x^2+3x)^2-22(x^2+3x)+72
用十字相乘法分解因式:a^2b^2+16ab+39
(2)15x^2n+7x^ny^n+1-4y2n+2
(3)(x^2+3x)^2-22(x^2+3x)+72
用十字相乘法分解因式:a^2b^2+16ab+39(2)15x^2n+7x^ny^n+1-4y2n+2(3)(x^2+3x)^2-22(x^2+3x)+72
(1) a^2b^2+16ab+39
1 13
x
1 3
=(ab+13)(ab+3)
(2) 15x^2n+7x^ny^n+1-4y2n+2
5 -4
x
3 1
=(5x^n -4y^n+1)(3x^n+ y^n+1)
(3) (x^2+3x)^2-22(x^2+3x)+72
1 -4
x
1 -18
=[(x^2+3x)-4] * [(x^2+3x)-18]
1 4 1 6
x x
1 -1 1 -3
=(x+4)(x-1)(x+6)(x-3)