（Ⅰ）求a，b的值；

（Ⅱ）若f（x）有极大值28，求f（x）在﹣3，3上的最小值．

阅读理解

    Do you get angry when your friends sing loudly? Or when your best friend does not wait for you after school?

    If you do ,you need to control(控制)your feelings and stop getting angry so easily .Getting angry easily can make you lose friends .

    Gary Egeberg , an American high school teacher ,wrote My Feelings Are Just Like Wild Animals to help you control your feelings .It tells teens how to stay cool when bad  things happen to them .The book says that getting angry only makes problems worse .It can not make them better：“Getting angry is not a natural way to act ,"the book says .  It is just a bad habit , like smoking .The book says you can control your anger easily ,and all you have to do is to tell yourself not to be angry .

    When a baby falls over ,it cries only when people are watching it .Like a baby ,you can only get angry if you are sure it is the right thing to do .

    The book gives many suggestions to help you if you get angry easily .Here are the top three .

①Keep a recorD.Every time you get angry ,write down why you are angry.· Look at it later and you will see you get angry too easily .

   ②Ask your friends to stop talking to you when you get angry. This will teach you not to be angry .

   ③Do something different .When you get angry ,walk away from the problem and go somewhere else .Try to laugh!

函数$f\left(x\right)={\log }_{3}x+x-3$的零点所在的区间是(   )

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