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5.5 整式的化简

义务教育课程标准实验教科书  浙江版 《 数学 》 七年级下册. 5.5 整式的化简. 例 1. 化简 :. 例 2 : 甲、乙两家超市 3 月份的销售额均为 a 万元 , 在 4 月和 5 月这两个月中,甲超市的销售额平均每 月增长 % , 而乙超市的销售额平均每月减少 %。. ( 2 )如果 a=150 , =2 ,那么 5 月份甲超市的销售额比乙超市多多少万元?. ( 1 ) 5 月份甲超市的销售额比乙超市多多少?.

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5.5 整式的化简

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  1. 义务教育课程标准实验教科书  浙江版《数学》七年级下册 5.5 整式的化简

  2. 例1 化简:

  3. 例2:甲、乙两家超市3月份的销售额均为a万元,例2:甲、乙两家超市3月份的销售额均为a万元, 在4月和5月这两个月中,甲超市的销售额平均每 月增长 %,而乙超市的销售额平均每月减少 %。 (2)如果a=150, =2,那么5月份甲超市的销售额比乙超市多多少万元? (1)5月份甲超市的销售额比乙超市多多少?

  4. 已知 ,你能求出下列各式的值吗? 例3

  5. 探究活动 观察下列各式: 你能口算末位数是5的两位数的平方吗?请用完全平方公式说明理由。

  6. 体会.分享 说能出你这节课的收获和体验让大家与你分享吗?

  7. C D E F · B P A M (2)当a=4,b= 时,S的值是多少? 例2:如图:正方形ABCD与正方形PBEF中,M是AB中点,设AB=4a,MP=b,正方形APCD与正方形PBEF的面积之差为S。 (1)用a,b的代数式表示S

  8. 时,求代数式 的值 练一练:

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