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(x1,y1), (x2,y2),若x1+x2=6,则AB的长度是( ) A.6 B.7 8 9
(-2,-9) (0,-5) (2,-9) (1,-6)
y=﹣2(x﹣1)2+6 y=﹣2(x﹣1)2﹣6 y=﹣2(x+1)2+6 y=﹣2(x+1)2﹣6
y=(x﹣2)2 y=(x﹣2)2+6 y=x2+6 y=x2
y=x2+4x+4 y=x2+6x+5 y=x2-1 y=x2+8x+17
y=x2﹣1 y=x2+6x+5 y=x2+4x+4 y=x2+8x+17
y=x2+2 y=x2﹣2x﹣1 y=x2﹣2x y=x2﹣2x+1
y=(x﹣1)2+4; y=(x﹣4)2+4; y=(x+2)2+6; y=(x﹣4)2+6
y= (x -2)2 y=x2 y=x2 +6 y= (x -2)2 +6
(x1,y1), (x2,y2)两点,如果x1+x2=6,那么|AB|等于 ( ). A.10B.8 6 4
y=2x2-4x-5 y=-2x2+4x-1 y=2x2+12x+19 y=-2x2-12x-17
(x1, y1) (x2, y2)两点,如果=6,那么= ( ) (A.)6 (B.)8 ( )9 ( )10
y=﹣2(x﹣1)2+6 y=﹣2(x﹣1)2﹣6 y=﹣2(x+1)2+6 y=﹣2(x+1)2﹣6
y=x2+1 y=x2﹣1 y=(x﹣1)2 y=(x+1)2