A:Happy and excited
B:Happily and excited
C:Happily and excitedly
D:Happy and excitedly
已知函数f(x)=|x﹣m|,关于x的不等式f(x)≤3的解集为﹣1,5.
(1)求实数m的值;
(2)已知a,b,c∈R,且a﹣2b+2c=m,求a2+b2+c2的最小值.
通过用自己制造的显微镜观察软木薄片从而发现了细胞的科学家是