若圆C:x^2+y^2-x+3y-27/2=0关于直线l:a/2x+4y+30=0对称,则直线l的倾斜角是多少?A π/6B 5π/6C π/3D 2π/3选项是 A 96B 36C 12D 6

来源：学生作业帮助网编辑：六六作业网时间：2024/11/25 01:42:45

若圆C:x^2+y^2-x+3y-27/2=0关于直线l:a/2x+4y+30=0对称,则直线l的倾斜角是多少?Aπ/6B5π/6Cπ/3D2π/3选项是A96B36C12D6若圆C:x^2+y^2-

若圆C:x^2+y^2-x+3y-27/2=0关于直线l:a/2x+4y+30=0对称,则直线l的倾斜角是多少?A π/6B 5π/6C π/3D 2π/3选项是 A 96B 36C 12D 6
若圆C:x^2+y^2-x+3y-27/2=0关于直线l:a/2x+4y+30=0对称,则直线l的倾斜角是多少?
A π/6
B 5π/6
C π/3
D 2π/3
选项是 A 96
B 36
C 12
D 6

若圆C:x^2+y^2-x+3y-27/2=0关于直线l:a/2x+4y+30=0对称,则直线l的倾斜角是多少?A π/6B 5π/6C π/3D 2π/3选项是 A 96B 36C 12D 6
圆的方程可以变为(x - 1/2)² + (y + 3/2)² = 16,圆心为C(1/2,-3/2)
圆C关于直线l对称,则C在该直线上:(a/2)(1/2) + 4(-3/2) + 30 = 0
a = -96
斜率 = -a/8 = 12
题中问的应当是斜率,而不是倾斜角,答案为C

a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式 x(x-y)2-(y-x)3 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x a/x-y,b/3y-3x,c/x^2-2xy+y^2通分计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 如果A={（x,y）|x,y+2>0},B={（x,y）|2x+3y-6>0},C={（x,y）|x-4 2X(2X-3Y)-3Y(X+Y) (-2x y)^2-(3y-x)(-x-3y) （x+2y)^2-(x+y)(3x-y) 计算(x+y)(x+y)^2(-x-y)^3 化简:5(x-y)+2(x+y)-3(x-y)