请教

monicamomo

1)  TU是个两位数(T是十位数,U是个位数).TU IS TWICE THE PRODUCT OF THESE   DIGITS ,U=?

2)EVERY INTERNAL ANGLE IN A POLYGON IS LESS THAN 180. HOW MUCH IS THE AVERAGE INTERNAL ANGLE FOR A POLYGON
1. THERE ARE TWO RIGHT INTERNAL ANGLE
2. THERE ARE FIVE VERTICE
答案是B,请问第2个条件什么意思?

jxtju

t=10/(2u-1)   t is integer  u=3

a have five angles

oddyuibe

to jxtju,

I think the euation should be: U=10T/(2T-1)====>U=6 (U is integer and less than 10)

Is that the word "Vertice"? eh....I don't know

likerock

Yes, confirm, agree with oddyuibe, U=6.