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(x﹣4)2+(y﹣7)2=5 (x﹣4)2+(y﹣7)2=25 (x﹣7)2+(y﹣4)2=5 (x﹣7)2+(y﹣4)2=25
(-2,1] [-1,1] [4,7) (-2,1]∪[4,7)
={0,1,2,4,5,7}, ={1,4,6,8,9}, ={4,7,9},则(A.∩B)(A.∩C)=( ) A.{1,4}B.{1,7}C.{4,7} {1,4,7}
(﹣1,4)的对应点为C.(4,7),则点 (﹣4,﹣1)的对应点D.的坐标为( ) A.(2,9)B.(5,3) (1,2) (﹣9,﹣4)
{1,4} {1,7} {4,7} {1,4,7}
{-4,-7,4} {-4/9,-7/9,4/9) {4/9,7/9,-4/9} {4,7,-4}
{-4,-7,4} {-4/9,-7/9,4/9) {4/9,7/9,-4/9} {4,7,-4}
(–1,4)的对应点为C.(4,7),则点 (– 4,– 1)的对应点D.的坐标为( ) A.(2,9)B.(5,3) (1,2) (– 9,– 4)
[-2,1)∪[4,7) (-2,1]∪(4,7] (-2,-1]∪[4,7) (-2,1]∪[4,7)
={0,1,2,4,5,7}, ={1,4,6,8,9}, ={4,7,9},则(A.∩B)(A.∩C)=( ) A.{1,4}B.{1,7}C.{4,7} {1,4,7}
(1,2)、 (3,5),将向量按向量a=(-1,-1)平移后得到向量为 ( ) A. (2,3)B. (1,2) (3,4) (4,7)