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- 131. 3. 4. 1.122.-58 1.2.3.1.2.910 1316 1.cc2.b3.4.1. 2. 3. 4. 5. 18191.6. 7. 8. 21241.- 25281. 9. 1.wn ni m pi y lio10. (1)2311. a12. a13. 14. 2932 - 1.15. 16. 17. 1.18. 3336 1.19. 20. b21. 22. 3740ling jnng ml jiqing gunf xngyng yng 1.23. 1.12324. 25. 26. 27. 4144 1228. 4546 20120526 911 .:,:,. .3 4 5011280034 .800080008000toefltoefl . copyright ? 2012 - - 2012-01-17 09:34:18| | 27p4-53/2 3/2 15/2; 14/9 14/9 4/95/3 5/3 5/637.5% 37.5%0.5 3/7,37.5%31 6/5,60%1.3 0.10.140%, 1.4, 33/20 190% 0.25 1 10x12-3.14x(10/2)=41.524x6/2+3.14x4/2)/2=18.2811/3 x 3/4- 1/5) / 3/10= 1/62 1 14+16/ (14+16+7+3+4+5+1) x 100%=60%214+16+7+3+4+5 / (14+16+7+3+4+5+1) x 100% =98% 1- 1 / (14+16+7+3+4+5+1) x 100%=98 %(3) p10-113/2 2/3 2/9 8/9 7/4 4/7 3/7 5y1/3 13/15 3/2 5/3 4/151100,40 2 1:3 3 270 4 1 3,2,1/4, 3/2 a, b , a, b, b, b,1 3,28 614 21,4 12,7 42,2 4,21 7,12, 242 1842 p16-171> ,< ,= <2ac b; c3 12/3 >1.66>116.7%34% > 1/3 >4 0.75=3/4=75%0.575=23/40=57.5% 0.3330.34=17/50=34%561 540x 44/44+45+46 =176540x 45/44+45+46 =180 540x 46/44+45+46 =1842309 / 618 = 0.5=50%(3) 3.14 x 16/2)/2=100.4829. 14x6/2)/2 + 6x6/2=32.13p22-231 1/24 13, 1 ,482 3/4 0.75 75% 5/8 0.625 62.5% 3/5 60%1921/23841/3576 2731/25461/3819 3271/26541/3981 2191/24381/36573<, >, > < ,> =43.09- 37/12 /(1.15+1/12) x 10% x4/7x x-4/7x=21x=4912000x3.14%x3+12000=13130.4( 1200x ( 1 - 99.5% ) = 6( = 0.0595 5
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