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【简答题】
探索发现： （1）计算下列各式： ①（x-1）（x+1）； ②（x-1）（x 2 +x+1）； ③（x-1）（x 3 +x 2 +x+1）． （2）观察你所得到的结果，你发现了什么规律？并根据你的结论填空： （x-1）（x n +x n-1 +x n-2 +…+x+1）=______（n为正整数）．
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反馈参考答案：
举一反三
【单选题】I can’t spend _____ money on the car which is _____ expensive for me.
A.
too much, far too
B.
far too, too much
C.
far too, too much
D.
too many, far too
【单选题】What does the man mean?
A.
He can't go too far away.
B.
The cafeteria isn't too noisy.
C.
He prefers to eat in a quiet place.
【单选题】According to the English legend, King Bladud lost his life because
A.
he flew too far.
B.
he flew too high.
C.
he fell to the ground.
D.
he was hit by a stone.
【单选题】This is______for me to do.
A.
far too difficult a job
B.
too far difficult a job
C.
far too a difficult job
D.
too far a difficult job
【单选题】Burton said he could not swim until the ______ came in because the sea was too far out.
A.
current
B.
tide
C.
water
D.
flood
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