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(2,5) (2,-19) (-2,5) (-2,-43)
x=1 x=2 x=3
(2,1) (﹣2,1) (2,5) (﹣2,5)
(-1,-1) (2,5) (1,6) (-2,5)
(-2,5) (-2,-5) (2,5) (2,-5)
x=1 x=2 x=3
x=﹣ x=1 x=2 x=3
(﹣2xy)2=﹣4x2y2 x6÷x3=x2 (x﹣y)2=x2﹣y2 2x+3x=5x2
(2,5), (4,1).若点P.(x,y)在线段AB上,则2x−y的最大值为 (A.)−1 (B.)3 ( )7 ( )8
={(x,y)|y=ax+1}, ={(x,y)|y=x+b},且A.∩B.={(2,5)},则( ) A.a=3,b=2 B.a=2,b=3 a=-3,b=-2 a=-2,b=-3
x=﹣ x=1 x=2 x=3