问题
解答题
（x2yz﹣1）2（2xy﹣2）﹣3
答案
题目分析：先计算积的乘方，再按照单项式与单项式的计算法则进行计算．
解：原式=x4y2z﹣2•2﹣3x﹣3y6=
xy8z﹣2=．
点评：注意负指数次幂应等于正指数次幂的倒数．
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（x2yz﹣1）2（2xy﹣2）﹣3
题目分析：先计算积的乘方，再按照单项式与单项式的计算法则进行计算．
解：原式=x4y2z﹣2•2﹣3x﹣3y6=xy8z﹣2=．
点评：注意负指数次幂应等于正指数次幂的倒数．
A certain good woman one day said something that hurt her best friend of many years.She____immediately and would have done anything to have taken the words back.____she said hurt the friend so much that this good woman was herself hurt____the pain she caused.____to cancel what she had done，she went to an older，wiser woman in the village，explained her situation，and asked for____. Listening to her，the older woman___the younger woman’s distress and knew she must help her.She also knew she could never____her pain，but she could teach.She knew the____would depend only on the character of the younger woman.She said，“Tonight，take your best feather pillows and put a single feather on the doorstep of each house in the town____the sun rises.” The young woman hurried____to prepare for her chore，even though the feather pillows were very____to her.All night long，she labored alone in the cold.Finally the sky was getting____，she placed the last feather on the steps of the last house.Just as the sun rose，she returned to____. “Now，” said the wise woman，“Go back and____your pillows with the feather you have put on the steps.Then everything will be____it was before.” “You know that’s____！The wind blew away each feather as fast as I placed them on the____！” The younger woman was surprised. “That’s true，” said the older woman.“Never forget.Each of your____is like a feather in the wind.Once spoken，no amount of effort，____how heartfelt or sincere，they can never return to your mouth.Choose your words well and____them most of all in the presence of those you love.”
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