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y=cy1(x)+y2(x) y=y1(x)+c2y2(x) y=c[y1(x)+y2(x)] y=c1y(x)-y2(x)
y-y1=k(x-x1) y=5kx+3 y =9k(x-x1) y=4x+b
3y-y1=x-x1 y=3kx+b-2 y-y1=k(x-x1) y=ax -4
x1=2 y1=2
x2=2 y2=1 x1=2 y1=2
x2=2 y2=2 x1=2 y1=1
x2=2 y2=2 x1=2 y1=1
x2=2 y2=1
y-y1=k(x-x 1) y=5k x+3 y=9k(x-x 1) y=4x+ b
y-y1=k(x-x1) y=5kx+3 y=9k(x-x1) y=4x+b
x1=2 y1=2 x2=2 y2=1 x1=2 y1=2 x2=2 y2=2 x1=2 y1=1 x2=2 y2=2 x1=2 y1=1 x2=2 y2=1
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
Ix1<Iy1,Ix1<Ix2 Ix1=Ix2,Ix2<Ix3 Ix2<Ix3,Iy1=Iy2 Ix2=Ix3,Iy2<Iy3
)y1 >y2 ( )y1 =y2 ( )y1 )不能比较