A:Do you think what she likes best
B:What do you think she likes best
C:What do you think does she like best
D:Do you think what does she like best
式子σ(a,b,c)满足σ(a,b,c)=σ(b,c,a)=σ(c,a,b),则称σ(a,b,c)为轮换对称式.给出如下三个式子:①σ(a,b,c)=abc;②σ(a,b,c)=a2-b2+c2;③σ(A,B,C)=cosC·cosA-B-cos2C(A,B,C是△ABC的内角).其中,为轮换对称式的个数是( )
小凡在寒假期间协助居委会进行了换届选举筹备工作。在这次的选举筹备工作中,小凡的建议不能被采纳的是( )
﹣7○﹣4
1.5○ 52
0○﹣2.5
﹣3○3
数轴:____
比较大小:____