最新北師大版數(shù)學(xué)七年級下冊第一章_整式的乘除知識點(diǎn)總結(jié)及練習(xí)題(已改無錯(cuò)字)
2022-09-05 11:04:14 本頁面
【正文】 16．下列各組數(shù)中，互為相反數(shù)的是…………………………………………………（ ?。ˋ）（－2）－3與23 （B）（－2）－2與2－2 （C）－33與（－）3 （D）（－3）－3與（）3 17．下列各式中正確的是………………………………………………………………（ ）（A）（a＋4）（a－4）＝a2－4 （B）（5x－1）（1－5x）＝25x2－1（C）（－3x＋2）2＝4－12x＋9x2 （D）（x－3）（x－9）＝x2－27 18．如果x2－kx－ab＝（x－a）（x＋b），則k應(yīng)為…………………………………（ ?。ˋ）a＋b （B）a－b （C）b－a （D）－a－b （三）計(jì)算（每題4分，共24分）19．（1）（－3xy2）3（x3y）2； （2）4a2x2（－a4x3y3）247。（－a5xy2）；（3） （2a－3b）2（2a＋3b）2； （4）（2x＋5y）（2x－5y）（－4x2－25y2）； （5） （20an－2bn－14an－1bn＋1＋8a2nb）247。（－2an－3b）；（6） （x－3）（2x＋1）－3（2x－1）2．20．用簡便方法計(jì)算：（每小題3分，共9分） （1）982； （2）899901＋1； （3）（）2002（）1000． （四）解答題（每題6分，共24分）21．已知a2＋6a＋b2－10b＋34＝0，求代數(shù)式（2a＋b）（3a－2b）＋4ab的值．22．已知a＋b＝5，ab＝7，求，a2－ab＋b2的值．23．已知（a＋b）2＝10，（a－b）2＝2，求a2＋b2，ab的值． 24．已知a2＋b2＋c2＝ab＋bc＋ac，求證a＝b＝c． （五）解方程組與不等式（25題3分，26題4分，共7分）25． 26．（x＋1）（x2－x＋1）－x（x－1）2＜（2x－1）（x－3）． Exists problem: recalled first half of of work, vehicles management although made has must of results, but and superior led of high standards, and strict requirements also has gap, away from social and people increasingly growth of service requirements also has insufficient, away from constantly new of car tube work also has many does not apply echo urgently solution of problem: main performance in: a is with I State urban and rural political, and economic, and culture of constantly prosperity development, driving people keep volume growth of momentum increased, third quarter, Will and ushered in driving people training exam work of and a unprecedented of peak, driving people exam work will faced new of pressure and challenge。 II is vehicles highspeed growth situation still will keep more long period, motor vehicle keep volume growth %, driving people keep volume growth %, led to this year motor vehicle keep volume 567,408 car is greater than driving people keep volume 565XX6 people of
范文總結(jié)相關(guān)推薦
鄂ICP備17016276號-1