种一批树苗，如果每人种10棵，则剩6棵树苗未种，如果每人种12棵，则缺14棵树苗．问有多少人参加种树？设有x人参加种树，可列出方程 ____

在三角形面积公式S=$\frac{1}{2}ah$，a=2cm中，下列说法正确的是（　　）

读图，回答下列问题。

   Bob is six years old．He is old enough to go to school． On the first day，his teacher taught him three words，“I，you，he”．Then the teacher said，“I am your teacher．You are my student．He is your student. He is your classmate.”When school was over，Bob went home. His mother asked him，“What has your teacher taught you today?”Bob said with a smile，“Listen，Mum and Dad，I am your teacher．You are my student．He is your classmate．”His mother said，“No，dear．You’re wrong．”Then she said，“I am your mother．You’re my son．He’s your father．”The next day，Bob’s teacher asked Bob to make sentences with “I，you and he”．
Bob stood up and said，“I’m your mother．You’re my son．He is your father．”All the students in Bob’s class laughed．