【简答题】在△ABC中,若 sinA+cosA= 1 5 ,则2sinA+cosA =______.
【简答题】在△ABC中,若sinA= 3 2 ,则∠A为______.
【简答题】在△ABC中.若b=5, ,sinA= ,则a= _________ .
【简答题】A. Yes, I'm ill. B. No, I don't think so. C. Yes, he's very well. D. I agree with you.
【简答题】在△ABC中,若a>b,则sinA( )sinB。(填“>”“
【简答题】在△ABC中,若│sinA- │+( - )=0,则∠C=_______
【单选题】命题“在△ABC中,若sinA= 1 2 ,则A=30°”的否命题是( )
A.
在△ABC中,若sinA= 1 2 ,则A≠30°
B.
在△ABC中,若sinA≠ 1 2 ,则A=30°
C.
在△ABC中,若 sinA≠ 1 2 ,则A≠30°
D.
在△ABC中,若A≠30°,则sinA≠ 1 2
【单选题】— Would you like to come to my birthday party? — Yes, ______ I'm very busy. [ ]