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#2
ymh072006-07-31 16:05
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a+1/(2/(b+c)+1/(b+c+d))-35=0
a+1/(2/(b+c)+2/(b+c+d))-30=0
a+1/(2/(b+c)+2/(b+c+d)+2/(b+c+2*d))-27=0
a+1/(2/(b+c)+2/(b+c+d)+2/(b+c+2*d)+2/(b+c+3*d))-25=0
求a、b、c、d。
谢谢!!
