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整式的化简

整式的化简. 合作学习. 如图,点 M 是 AB 的中点,点 P 在 MB 上,分 别以 AP , PB 为边,作正方形 APCD 和正方 形 PBEF. 设 AB=4a , MP=b ,正方形 APCD 与正方形 PBEF 的面积之差为 S. C. D. (1) 用 a,b 的代数式表示 S ;. E. F. (2) 当 a=4,b=0.5 时, S 的值 是多少?怎样计算才比 较简便?. A. B. M. P. 例 1 化简:. (1) (2x-1)(2x+1)-(4x+3)(x-6).

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整式的化简

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  1. 整式的化简

  2. 合作学习 如图,点M是AB的中点,点P在MB上,分 别以AP,PB为边,作正方形APCD和正方 形PBEF.设AB=4a,MP=b,正方形APCD 与正方形PBEF的面积之差为S. C D (1)用a,b的代数式表示S; E F (2)当a=4,b=0.5时,S的值 是多少?怎样计算才比 较简便? A B M P

  3. 例1 化简: (1) (2x-1)(2x+1)-(4x+3)(x-6) (2) (2a+3b)2-4a(a+3b+1)

  4. 练一练:化简下列各式 (1) (x+6)2-(3+x)(3-x) (2) 3x(x2+3x+8)+(-3x-4)(3x-4) (3) (2x-5y)(2x+5y)-(4x+y)2

  5. 填一填 • 一块手表原价100元,降价10%, • 则现价为_____元。 90 2. 一块手表原价a元,降价x%,则 现价为_______元。 a(1-x%) 3. 一块手表原价a(1-x%)元,降价x%,则现价为_________元。 a(1-x%)2

  6. 想一想 1. 一块手表原价a元,涨价x%,则 现价为_________元。 a(1+x%) 2. 一块手表原价a元,连续两次涨价 x%,则现价为_________元。 a(1+x%)2

  7. 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x%,而乙 超市的销售额平均每月减少x%. (1) 5月份甲超市的销售额比乙超市多多少? (2) 如果a=150,x=2,那么5月份甲超市的 销售额比乙超市多多少万元?

  8. 思考题 已知x+y=3,xy=1, 求x2+y2与(x-y)2的值.

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