Bài 11

a1 = float(input("a1 = "))
b1 = float(input("b1 = "))
a2 = float(input("a2 = "))
b2 = float(input("b2 = "))

print(f"Phuong trinh: ({a1}x + {b1})({a2}x + {b2}) = 0")
nghiem = []

if a1 != 0:
    x1 = -b1 / a1
    nghiem.append(x1)
    print(f"{a1}x + {b1} = 0  =>  x = {x1}")
else:
    if b1 == 0:
        print("Nhan tu dau luon = 0, phuong trinh co vo so nghiem")
    else:
        print("Nhan tu dau luon != 0, bo qua")

if a2 != 0:
    x2 = -b2 / a2
    nghiem.append(x2)
    print(f"{a2}x + {b2} = 0  =>  x = {x2}")

if nghiem:
    print(f"Tap nghiem: {set(nghiem)}")