已知點O(0,0),A(1,2),B(4,5)及向量OP=向量OA+t倍向量AB
已知點O(0,0),A(1,2),B(4,5)及向量OP=向量OA+t倍向量AB
四邊形OABP是否能成為平行四邊形?若能,則求出t的值,若不能,說明理由
四邊形OABP是否能成為平行四邊形?若能,則求出t的值,若不能,說明理由
數(shù)學(xué)人氣:569 ℃時間:2019-10-19 20:39:24
優(yōu)質(zhì)解答
OA = (1,2)PB = OB - OP= OB - OA-tAB=(4,5) - (1,2) - t(3,3)=(3-3t,3-3t)ifOABP是平行四邊形=>OA = PB=> (1,2) = (3-3t,3-3t)=> 1 = 3-3t and 2=3-3tno such t exists=>OABP不是平行四邊形
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