【简答题】Fred is second in maths in our class, but beliveve it or not, he _____ passed the last exam. [ ] A. easily B. hardly B. actually D. successfully
【单选题】设函数u(x,y)=ψ(x+y)+ψ(x—y)+∫x-yx+yψ(t)dt,其中函数ψ具有二阶导数,ψ具有一阶导数,则必有
【单选题】设函数 ,其中函数 具有二阶导数, 具有一阶导数,则必有( )
【简答题】设函数u(x,y)=φ(x+y)+φ(x-y)+ψ(t)dt,其中函数φ具有二阶导数,ψ具有一阶导数,则必有______. (A) (B) (C)设函数u(x,y)=φ(x+y)+φ(x-y)+ (t)dt,其中函数φ具有二阶导数,ψ具有一阶导数,则必有______。
【单选题】Fred is second to none in math in our class,but ________,he hardly passed the final math exam. [ ]
【单选题】Fred is second to none in English in our class, but believe it or not, he _____ passed the last exam.
【单选题】Fred is second to none in maths in our class, but believe it or not, he ________ passed the last exam.
【单选题】Fred is second to none in maths, but he ____ passed the last exam.