A.2) p = 7, x = 4, y = 1
3) n = 1, n = 3
B.2) p = 7, x = 1, y = 4
3) n = 1, n = 3
C.2) p = 7, x = 1, y = 4
3) n = 1, n = 2, n = 3
D.2) p = 7, x = 1, y = 4
3) n = 1, n = 2, n = 3, n = 4

A.minB=1/5
B.minB=2/5
C.minB=3/5
D.minB=4/5

A.10km/h và 30km/h
B.20km/h và 40km/h
C.10km/h và 40km/h
D.20km/h và 30km/h

A.(x;y) = (-21/23;105/53)
B.(x;y) = (21/23;105/53)
C.(x;y) = (21/23;-105/53)
D.(x;y) = (-21/23;-105/53)

A.m = -5/4 , m = -1
B.m =5/4, m = -1
C.m = -5/4, m = 1
D.m = 5/4, m = 1

A.a) (-1;-5)
b) AB = 160km
B.a) (-1;5)
b) AB = 160km
C.a) (-1;-5)
b) AB = 60km
D.a) (-1;5)
b) AB = 60km

A.minP=23
B.minP=24
C.minP=25
D.minP=26

A.(x;y)=(1/5;2/5)
B.(x;y)=(4/5;6/5)
C.(x;y)=(8/5;19/5)
D.(x;y)=(1/5;6/5)

A.(3;1)
B.(-3;1)
C.(3;-1)
D.(-3;-1)

A.a) m > 1
b) minP = 18
B.a) m < 1
b) minP = 8
C.a) m>1
b) minP=8
D.a) m < 1
b) minP=18