ตอบ:
# การ y = 5/1 (x-07/10) ^ 2 + 47/245 #
คำอธิบาย:
# 1 / 5x ^ 2-4 / 7x + 5/3 #
# = 5/1 (x ^ 2-20 / 7 เท่า) + 5/3 #
# = 5/1 (x ^ 2-20 / 7x + (20 / 7divide2) ^ 2- (20 / 7divide2) ^ 2) + 5/3 #
# = 1/5 (x-10/7) ^ 2-1 / 5 * 100/49 + 3/5 #
# = 5/1 (x-10/7) ^ 2 + (3 * 49-100) / (5 * 49) #
# = 5/1 (x-07/10) ^ 2 + 47/245 #
