Question

$frac{a+b}{a}$, если $frac{7b-51a}{11a+12b} =6$

Answer 1

( 7B - 51A ) / ( 11A + 12B ) = 6 
11A + 12B ≠ 0
7B - 51A = 6 * ( 11A + 12B ) 
7B - 51A = 66A + 72B 
66A + 51A = 7B - 72B 
117A = - 65B 
A = - ( 65/117 ) B 
A = - ( 5/9 ) B 
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1) A + B = - ( 5/9 ) B + B = 4/9B 
2) ( 4/9 )B : ( - 5/9 ) B = - ( 4/5 ) = - 0,8