註冊日: 2004-07-28 發表數: 143 University of Texas at Austin
Re: 123
make x as the circumference of the front wheel 1000/x -1000/(x+3) =75 x=5 or -8(不合) x=5 Ans: 5 meters
_________________ Atra esternī ono thelduin Mor'ranr līfa unin hjarta onr Un du evarīnya ono varda. May good fortune rule over you Peace live in your heart And the stars watch over you.
2006-08-18 21:53
ian830819 Just popping in
註冊日: 2007-01-29 發表數: 15 台灣
Re: 123
設前車輪周長X公尺 後車輪x+3公尺 1000/x=1000/(x+3)+75 75x(x+3)/x(x+3)+1000x/x(x+3)=1000x+3000/x(x+3) 75x平方+225x-3000=0 x平方+3x-40=0 x=5 or -8(不合)
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