(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoective(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoectively,the triangle ABC is( ) A,a ri
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![(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoective(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoectively,the triangle ABC is( ) A,a ri](/uploads/image/z/10763437-13-7.jpg?t=%281%29+The+coordinates+of+the+three+points+A%2CB+C+on+the+plane+are+%28-5%2C-5%29%2C%28-2%2C-1%29and%28-1%2C-2%29%2Cresoective%281%29++The+coordinates+of+the+three+points+A%2CB++C+on+the+plane+are+%28-5%2C-5%29%2C%28-2%2C-1%29and%28-1%2C-2%29%2Cresoectively%2Cthe+triangle+ABC+is%28+++%29+++++++++++++++++A%2Ca+ri)
(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoective(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoectively,the triangle ABC is( ) A,a ri
(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoective
(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoectively,the triangle ABC is( )
A,a right triangle ,B an isosceles triangle C,an equilateral triangle D,an obtuse triangle
(2)Leta,b and c be rational numbers and b =12/5-13/5a, c=13/5-12/5a, then
aXa -bXb+cXc=( )
(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoective(1) The coordinates of the three points A,B C on the plane are (-5,-5),(-2,-1)and(-1,-2),resoectively,the triangle ABC is( ) A,a ri
第一个为等腰三角形,选B
第二个为1