中二數學，後天7-30A.M.前，20點－aptzmcv的部落格

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中二數學，後天7:30A.M.前，20點

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圖片參考：http://imgcld.yimg.com/8/n/HA05404334/o/701109270105413873467770.jpg 圖片參考：http://imgcld.yimg.com/8/n/HA05404334/o/701109270105413873467781.jpg 非常感謝！！！！！！更新: 按Ctrl和+可以放大。更新 2: Q27-32:http://clip2net.com/page/m79400/17803312 Q33-36:http://clip2net.com/page/m79400/17803318 更新 3: Q32-36呢？更新 4: Q34-36呢？

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27 a)ratio =2500:4000 =5:8 b)TV=4000*80%=3200$ carmer=2400$ c) ratio =2400:3200 =3:4 28 a)ratio of A,B and C =1*6:3*6:3*5 =2:6:5 b)A get 32500*2/(2+6+5)=5000 B get 32500*6/(2+6+5)=15000 C get 32500*5/(2+6+5)=12500 29 volume of te water =315*2/(2+7)=70ml grapes juice's volume=70+25=95ml 30 a)there are =90/(3/(2+3))=150 students so there are =150/(25/(25+2)) =162 teachers b) ratio of teachers:students =160:144 =10:9 students of boys:girs =(150-90-6):90 =54:90 =3:5 31 let lung's age is yonger than his mother's of 24years ie. x=y-24...(1), x-3:y-3=1:3...(2) from (2),x-3=y/3-1 x=y/3+2 then y-24=y/3+2 2y/3=26 y=39 x=15 lung's age is 15 and his mother's age is 39 b)ratio of their age is 15:39 c)15+n:39+n=2:5 75+5n=78+2n 3n=3 n=1after a year later,their age's ratio will be 2:5 now offing... 2011-09-29 08:09:00 補充： 32. let ratio of xiao(A):yuan(B)=2/3 ratio of Wei(C):B=2:1 ie. B:C=1:2 ratio of A:B:C =2*1:3*1:3*2 =2:3:6 A get 418*2/11=76 B get 418*3/11=114 C get 228 2011-09-29 08:09:07 補充： 33. permeater=(18/(1/500)+9.2/(1/500))*2=27000cm=270m area=(18/(1/500)*9.2/(1/500))=41400000cm^2=4140m^2 4140/6.8 = 608.823529=609 s cor to 3 sig fig 609*2=1218s=20.3mins zhi wen run about 20.3mins for running a football pitch (wide=46m,lenght=90m)

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