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1£¬a triangle,two vertices on the(x,y) lines,(a,0),(0,b), is it a right triangle?
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2£¬a set is vertices on a cube, each vertice is not on the same line(±ß£©£¬how many vertices in the set.
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5£¬tom bought 2 APPLE 60cents,  mary bought 3 apples 75cents, what percent is  one  apple mary bought less than that of tom.( 16.7%,)
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  3 units a,b,c   abc+bac=998, how many abc could be?
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