Vẽ flowchart phương trình bậc 2

ax2 + bx + c = 0

ax2 + bx + c = 0

TH1: a = 0
	- PTB1: bx + c = 0 -> Vẽ flowchart cho phương trình bậc 1
		TH1.1: b != 0 -> PT co nghiem duy nhat x = -c/b
		TH1.2: b = 0
			TH1.2.1: c = 0 -> PTVSN
			TH1.2.2: c != 0 -> PTVN
TH2: a != 0
	dt = b*b - 4ac
		TH2.1: dt < 0 -> PTVN
		TH2.2: dt = 0 -> PT co nghiem duy nhat: x1 = x2 = -b/2a
		TH2.3: dt > 0 -> PT co 2 nghiem
			x1 = (-b + sqrt(dt))/2a
			x2 = (-b - sqrt(dt))/2a

-> Ve flowchart
Yeu cau: Xac dinh dc du lieu dau vao + du lieu dau ra
	du lieu dau vao: a, b, c
	du lieu dau ra: x???