Question 206069
{ (ab+b^2) / (4ab^5)} / {(a+b)/(6a^2b^4)}
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invert  and  multiply 
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{ (ab+b^2)/(4ab^5)} * {(6a^2b^4)/(a+b)}
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factor  and  simplify  by  cancelling  like  terms
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{ (b)(a+b) / (4 a b^5)}  *  { (6 a^2 b^4)/ (a+b) }
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{   3 a  /2 }
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(3/2) a   =  1.5a
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check,,,Let  a = 2,,,,b=1,,,,both  original  and  answer  = 3,,,,ok