若a-1+b+2=0,点M(a,b)在反比例函数y=kx的图象上,则反比例函数的解析式为( )
(1x2-2x-1x2-4x+4) ÷ 2x2-2x ,其中x=2(tan45°-cos30°).
She said that she would do _______ she could __________ her daughter laugh.