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﹣2x+2y 6x+2y ﹣2x﹣8y 6x﹣8y
2x>3y>5z 3y>5z>2x 3y>2x>5z 2x>5z>3y
B.两点,则AB的垂直平分线方程为( ) A.x+y+3=0 2x-y-5=0 3x-y-9=0 4x-3y+7=0
若x2=y2,则x=y 若,则x=y 若x(x﹣2)=5(2﹣x),则x=﹣5 若(m+n)x=(m+n)y,则x=y
y2-(6x-y+3z)=y2-6x-y+3z 9y2-[x-(5z+4)]=9y2-x+5z+4 x+[-6y+(5z-1)]=x-6y-5z+1 -(7x+y)+(z+4)=-7x-y-z-4
6 6 12 6 6 10 9 5 10 5 10 10 9 6 12 9 10 15 9 5 10 5 4 10
(-1,5), (5,5), (6,-2)的圆的方程是( ) A.x2+y2+4x-2y-20=0 B.x2+y2-4x+2y-20=0 C.x2+y2-4x-2y-20=0 x2+y2+4x+4y-20=0
B.两点,则AB的垂直平分线的方程是( ) A.x+y+3=0 2x-y-5=0 3x-y-9=0 4x-3y+7=0
(5x+3)/(2y一6) x*5+3/2*y-6 (5*x+3)÷(2*y-6) (x*5+3)/(y*2-6)
x>5 x< x<-6 x>-6
x+y-5=0 x+y+5=0 2x+y-5=0 2x+y+5=0
(2,3), (4,-5)到它的距离相等,则这条直线的方程是( ) A.4x+y-6=0 B.x+4y-6=0 2x+3y-7=0或x+4y-6=0 3x+2y-7=0或4x+y-6=0
5x﹣(x﹣2y)=5x﹣x+2y 2a2+(3a﹣b)=2a2+3a﹣b (x﹣2y)﹣(x2﹣y2)=x﹣2y﹣x2+y2 3x2﹣3(x+6)=3x2﹣3x﹣6
y=6sin(5x+15)+2 y=6sin(5x-15)+2 y=6sin(5x+15)-2 y=6sin(5x-15)-2