It's 9:2001, 2000 × 1949 and 24 × 43:51 + 51 × 43:19. I can't type it. Please write it on the title paper according to my words and think about it It's all about simple calculation

It's 9:2001, 2000 × 1949 and 24 × 43:51 + 51 × 43:19. I can't type it. Please write it on the title paper according to my words and think about it It's all about simple calculation

(362+548*361)/(362*548-186)
(204+584*1991)/(1992*584-380)-1/143

(362+548*361)/(362*548-186)
=（362+548*361）/（361*548+548-186）
=（362+548*361）/（362+548*361）
=1
(204+584*1991)/(1992*584-380)-1/143
=（204+584*1991）/（1991*584+584-380）-1/143
= 1-1/143
=142/143

30135÷(398-156-144)
How to simplify the calculation?
If you want to divide by 98, it's also called simple calculation. The problem is that 30135 divided by 98~

30135/【398-（156+144）】
=30135/（398-300）
=30135/98
=307.5

How to do two simple problems
81.23-40.5/0.81*1.075=?
36.47*109-0.9*364.7=?

81.23-(40.5/0.81)*1.075=81.23-50*1.075= 27.48
36.47*109-0.9*364.7=36.47*109-9*36.47=36.47*(109-9)=3647