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1,已知(x + my)(x + ny)= X平方+ 2xy

2019-08-14 08:06:57   来源:365bet亚洲官网   作者:365bet网站   【 评论:
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1)
x ^ 2 + nxy + mxy + mny ^ 2 = x ^ 2 +(n + m)xy + mny ^ 2 = x ^ 2 + 2xy-6y ^ 2n + m = 2,mn = -6(m + n)Mn = 2 *( - 6)= -122
A ^ 2 + 1 / a ^ 2 = 3(a-1 / a)^ 2 = a ^ 2-2 + 1 / a ^ 2 = 3-2 = 1a-1 / a = 1ora-1 / a = -13)
4x ^ 2-3(a-2)x + 25 = 09(a-2)^ 2-400 = 0(a-2)^ 2 = 400 / 9a-2 = 20/3,pray-2 = -20/ 3rd = 26/3th = 2-20 / 3 = -14/34
y = x ^ 2 + 6x-15 =(x + 3)^ 2-24x = -3,ymin = -246。
(A + b)^ 2-1 = 63(a + b)^ 2 = 64a + b = 8ora + b = -87
9x ^ 2 + m + 4 = 0-4 * 9(m + 4)= 0m = -48
(X + 2)^ 2 +(x-3)^ 2 = 13x ^ 2 + 4x + 4 + x ^ 2-6x + 9 = 132x ^ 2-2x = 0x ^ 2-x = 0x(x-1)= 0x = 0,x = 1x = 0,(x + 2)(3-x)= 2 * 3 = 6 x = 1,如果(x + 2)(3-x)= 3 * 2 =6然后(x + 2)(3-x)= 6