✔ 最佳答案
請問(c / 770)^3=2150 這題答案是9938.1 是怎麼算?
Sol
設f(x)=x^3-2150
f(12.9)~2146.689-2150~-0.3311<0
f(12.91)~2151.6851-2150~1.6891>0
1.6891>0>-0.3311
(12.91+12.9)/2~12.905
f(12.905)~2149.186-2150~-0.814
1.6891>0>-0.814
(12.91+12.905)/2~12.9075
f(12.9075)~2150.4353-2150=0.4353
0.4353>0>-0.814
(12.9075+12.905)/2~12.90625
f(12.90625)~21498.105-2150~-01895
0.4353>0>-0.1895
(12.9075+12.90625)/2~12.906875
f(12.906875)~2150.1235-2150~0.1235
0.1235>0>-0.1895
(12.906875+12.90625)/2~12.906562
f(12.906562)=2149.9665-2150=-0.0335
So
c/770~12.906562
c~9938.0527