解答

For your reference

Call me Bravo

AD line can find out y=2x easily.

yohou

我想問,題目說座標「依序」題目的一下四個,為什麼(x,2x)不是C點,卻是設成D點

Call me Bravo

You can say that again

yohou

?

Call me Bravo

Not key point

yohou

I mean that the question said 4 spots set on the (x.y) should arrange counterclockwise. That is, ur pic was wrote D before C. C. should be wrote before D.

Call me Bravo

I had said you are right,your care is serious but it’s not key point.

yohou

我想知道為什麼不能用向量算?我的算式哪裡錯了

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