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y. A. - 4. B. 0. x. -2. 畅所欲言. 观察图象 , 你能想到哪些信息?. 知识回味 其乐无穷. 一次函数. y =kx+b (k≠0). b=0. 正比例函数. y=kx ( k≠0). b>0. y 随 x 增大而增大. K>0. b0. y 随 x 增大而减小. K
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1 , , , y x
A-1aB3by=3x+ 4 ab a > b a = b a < b
. 12 y x (2)?(4)(1)______.(-2-1)
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5.yt361yt(2)4
AB4 8:00AB 8:20BA Ayx()(1)A .(2)
1y=kx+bAB kx+b0 ( ) AX0 BX3 C x2 D-3x2:2. y=ax+b y=kx P, x .
3.l1l2 A4B4C4D4XY123456100200300400500l1l2OB
A12020B20012C60D10145185
5. x()y ()(1)Yx(3)12.8(2)
ADPBCPBPDOxADM= 2ADP.
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