ab = 200
a - b = 120
So,
a(a - 120)= 200
Answer? - 120a - 200 = 0
a = [ 120 √ 120？ + 800] ÷ 2
a = 60 10√38
a 1 = 60 + 10√38
a2 = 60 - 10√38
Summary of teachers' teaching and scientific research 100 words 1
Looking back on this semester's teach