– What do you think Sally will be when she grows up?– She loves science so much. I think she'll be an .
A:engineer
B:actor
C:English teacher
已知a,b,c∈R,二次函数f(x)=ax2+bx+c,集合A={x|f(x)=ax+b},B={x|f(x)=cx+a}.
(Ⅰ)若a=b=2c,求集合B;
(Ⅱ)若A∪B={0,m,n}(m<n),求实数m,n的值.
若x=4是关于x的方程x2-a=4的解,则a的值为( )
下列动作中,最接近于1s的是( )