论文部分内容阅读
题已知空间四向量PA,PB,PC,PD满足λ1PA+λ2PB+λ3PC+λ4PD=0,λ1,λ2,λ3,λ4为实数,|PA|=m,|PB|=n,|PC|=s,|PD|=t.试求∠PBC,∠PCD,∠PDB.(注:供题人对第一位正确解答者给予奖金50元)有奖解题擂台(84)@代银$安徽省淮南市第三中学!232001
Known spatial quadratic vectors PA, PB, PC, PD satisfy λ1PA+λ2PB+λ3PC+λ4PD=0, λ1, λ2, λ3, λ4 are real numbers, |PA|=m, |PB|=n, |PC|= s,|PD|=t. Try to find PBC, ∠PCD, ∠PDB. (Note: For the right person to give a bonus of 50 yuan to the first correct answerer) There is a prize solution 擂台(84)@代银$ Anhui The third middle school of Huainan City, the province! 232001