2. (a) Show that the vectors i – 2j + 3k, 2i + 4k and 3j form a right–angled triangle where i, j, k are the unit vectors perpendicular to each other. 5 (0) (b) Solver by Cramer’s Rule: x + y + z = 6, 2x –
W:Yes,Iknow.Ireallywanttogowithyou.Butwearegoingtohaveamathsexaminstead. 3.Whatwillthewomando? A.VisitDisneyland. B.Haveatest. C.Gowiththeman. 答案:B Text4 W:Whydoesyourfatherdriveyoutoschoolinthatoldcar?Iknowyoucanaffordtobuyanicerone. M:Wedontwanttowastemoney.Wewillbuyanewcarwhenweneedit...
1. a number of objects or people grouped or belonging together, often forming a unit or having certain features or characteristics in common: a set of coins; John is in the top set for maths. 2. a group of people who associate together, esp a clique: he's part of the jet set. ...