This desk is light enough for him to carry. (改为同义句)
This desk is____light ____he can carry it.
若等腰三角形的一边长为10,另一边长为7,则它的周长为( )
若向量m→=(1,2),n→=(﹣2,1)分别是直线ax+(b﹣a)y﹣a=0和ax+4by+b=0的方向向量,则a,b的值分别可以是( )