0202120.5 20 250.5 220202520.1250.25 roots(20,21,f)= 2020063200310.063 2020.03120 6202001620.00800 72000820016200120008 820.0082001220.010004 2001200122001110002 (2)Bifid(a, b, f ): while (|> 10-5 a +b fag←1 f(a)f(c)>0 while flag ag←0 f(x):=2x+3.5x-+1.9x-2.5 Bifido0,1,f)=0.5583267 root(f(x),x)=0.55833309roots(20,21,f) 0 1 2 3 0 1 2 3 4 5 6 7 8 9 20 21 20.5 1 20 20.5 20.25 0.5 20 20.25 20.125 0.25 20 20.125 20.063 0.125 20 20.063 20.031 0.063 20 20.031 20.016 0.031 20 20.016 20.008 0.016 20.008 20.016 20.012 0.008 20.008 20.012 20.01 0.004 20.01 20.012 20.011 0.002 = (2) Bifid(a,b,f) c a + b 2 ¬ flag ¬ 1 flag ¬ 0 a ¬ c min f(a)×f(c) > 0 flag æ ç è ö ÷ ø æ ç è ö ÷ ø while flag ¬ 0 b ¬ c while flag b - a 10- 5 while > c := f(x) 2x 3 3.5 x 2 := + × + 1.9×x - 2.5 Bifid(0, 1,f) = 0.5583267 root(f(x), x) = 0.55833309