mononomials of the coordinates是什么意思?

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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 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=（ ）