Mathematics
Senior High
2ばんの解き方教えてください!答えは2と-3です!
2a=(2,x),
x) =(x+1,3)とする。
(1) 2a+と-26 が垂直になるように, xの値を定めよ。
(2) 2a+とa-2が平行になるように,xの値を定めよ。
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