I have four ruler.____ 改为____
—How many more oranges can I have? —You can have one more. ______ are for Tom.
{x2+2xsinA1+sinA2=0x2+2xsinA2+sinA3=0x2+2xsinA3+sinA1=0 均有实根,求这凸4n+2边形各内角的度数.