Mathematics
Senior High
解答と解説お願いします
三角形OAB があり、点Pを
OP= (s+t)OA-(s-t)OB
で定める. s, tが
s≧0,
t≧0,
1≤s+2t≤2
を満たしながら動くとき,点Pの存在する範囲を図示せよ. また, その面積は三角形
OAB の面積の何倍か.
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