20xx外研版(一起)四上unit2hedidn’tcomeback内容摘要:
). went e back Let39。 s look and say ( )didn’t have ( ). Ma Liang painted ( ). ( ) was happy. The old man a house a houseThe old man ( ) didn’t have ( ). Ma Liang painted ( ). ( )was happy The man a cow a cow The man ( ) didn’t have ( ). So Ma Liang painted ( ) . ( ) was happy. This old woman foodfood The old woman ( ) didn’t have clothes. Ma Liang painted ( ). ( ) were happy. The childrenclothes The children Group work: 小组讨论。20xx外研版(一起)四上unit2hedidn’tcomeback
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, ∴ S Ⅲ + S Ⅱ =-12t an α -12(π - α ) + 1 -π4 =-12t an α +α2+ 1 -34π , S Ⅳ + S Ⅰ =π2-12t an α-12 α -π2 =-12t an α-12α +34π , ∴ ( S Ⅱ + S Ⅲ ) ′ =12-12c os2α=c os2α - 12c os2α0 , ( S Ⅰ + S Ⅳ ) ′
所 以2si n 112 ( ) .si nc os 2 si n22xxx x • (3)令 • 则 21u x x , 12 2 2222211 ( 1 ) 1 1 ( 1 )211.11u x x x xx x xxx
C于 A、 B两点,求弦 AB的中点的轨迹方程 . P A B M lc • 拓展提升: • 1) .对于直线与圆锥曲线相交所得弦中点问题(点差法,) • 2) .求直线与圆锥曲线相交的有关问题时, 应特别注意必须在 0的情况下进行 • 3) .求 圆的切线方程和与圆有关的轨迹、最值等问题时,应首先考虑圆的个性(圆的几何性质),利用其几何性质解题往往能避繁就简。 但也应学会其通性通法。
0, 则 ┐ p是 ┐ q的 ( ) (A)充分不必要条件 (B)必要不充分条件 (C)充要条件 (D)既不充分也不必要条件 已知 p: |x+1|> 2, q: x2< 5x- 6, 则非 p是非 q的( ) A A 设集合 M={x|x2},N={x|x3}, 那么” x∈ M或 x∈ N”是“ x∈ M∩N”的 ( ) B必要不充分条件 C充分不必要 D不充分不必要 B a∈ R
Thanksgiving? November December October 2) What do people eat? breakfast dinner lunch 3) What do people say? Thank you sorry goodbye Thanksgiving is in November. 感恩节在每年11月的第四个星期四。 1) When is
hips chips chips chips chips chips chips chips chips chips chips chips I’m eating … What are you eating? 小朋友们,你能帮我将这些食物归类吗。 Chinese fast food English fast food 快餐 西式快餐 : 是指可以迅速准备和供应的食