A)7c²/9a
b)(y-3x)(y+3x)/6x(3x-y)=-(y+3x)/6x
№1
1.0,4с=0
с = 0
2.0,4с=1
с = 2,5
3.0,4с=-1
с=-2,5
4.0,4с=10
с=25
№2
1.6bс = 12
bс = 2
b = 1 c = 2
b = 0.5 c = 42.6bc = -60bc = -10b = -1 c = 10b = -2 c =5
3.6bc = 0
bc = 0
b = 1 c = 0
b =0 c =37
4.6bc = 3
bc = 0.5
b = 1 c = 0.5
b = 2 c = 0.25
Ax(y-c)+c(c-y)=ax(y-c)-c(y-c)=(y-c)(ax-c).