Yesterday my mother bought ____ (my) a new skirt.
函数f(x)=asinx+bxcosx﹣2ctanx+x2,若f(﹣2)=3,则f(2)=____ .
如果(2+2)2=a+b2(a,b为有理数),那么a+b等于( )
2.8×0.75÷(1.2+0.3)=____