粮食产量增产11%,记作+11%,则减产6%应记作______.
∵增产11%,记作+11%,
∴减产6%应记作-6%.
故答案为:-6%.
设函数f(x)=xsinx的导函数为f′(x),则f′(x)等于( )
A.xsinx+xcosx
B.xcosx-xsinx
C.sinx-xcosx
D.sinx+xcosx
Never ________ forget the days when ________ together with you. [ ]
A. shall I; did I live
B. shall I; I lived
C. I shall; I lived
D. I shall; did I live