Let R be the relation on Z×Z ,that is elements of this relation arepairs of pairs of integers,such that ((a,b),(c,d)) ∈ R if and only ifa+d = b+c.Is R an equivalence relation?Explain.

let me be the let me be the 高数微积分求体积Let R be the region {(x,y): 0 let the reason be love Let the classics be classics 英语翻译Let (S,R) be a poset.Show that (S,R^-1) is also a poset,where R^-1is the inverse of R. let the past be the past The Beatles 唱的 Let it be Let go,may be the best choice. let the more loving be meshi Let's the pass be passed be let in on the ground be let in on the ground 英文微积分题目Let R be the smaller of the two regions enclosed by the elipse 144x^2+16y^2=2304 and the line x=2^(3/2) . Find the area of the region R. If equal affection cannot be,let the moreloving be me. im hungry now.let's go to a r to have some food and drink.H up,tom ,or we‘ll be late for claim hungry now.let's go to a r to have some food and drink.H up,tom ,or we‘ll be late for clas.I have two t foe the film.Let’s go tosee the film Let X and Y be vectors in R^3 which are non-collinear with the origin,and let Z be a vector in R^3 that does not lie on the plane spanned by X and Y.Then it is possible to express any other vector V in R^3 as a linear combination of X,Y,and Z. 商半群的二元运算问题Let(S,*) be the semigroup whose operator table is given below.Let R be the equivalence relation on S defined by the partitin {{x,y},{z,w}}.construct the operator table for qoutient semigroup (S/R,#).本来中间是有个