Monthly Archives: December 2010

几天前， 我们收到一张大毛带回来的纸条。 上面是老师以学生的口气写的得一段话： Dear mama and papa,  I wrote a letter to Santa, but I will need your help to mail my letter . Please write my home address and place a stamp on the envelope. Pleas mail my letter … Continue reading →

Kingsong now is working on Exponents and Radicals. This weekend he brought back a text. He did it all right except for one item. Evaluate: (k -2x+ kx) 2   =    k -2x.2+ k2x  = k -4x+ k2x  I was very … Continue reading →