直线l:(2a﹣1)x﹣(a+3)y﹣(a﹣11)=0(a∈R)交x轴正半轴于点A,y轴正半轴于点B,当三角形AOB(O为坐标原点)面积最小时a的值为 .
It's very helpful to (讨论) your problems with your parents.
Believing in yourself is the first step on the road to (成功).
Mike is so smart that he can answer these questions (容易地).
Look!The (树叶) on the trees are in different shapes!
Children should be e to make decisions by themselves.