Răspuns:
Explicație pas cu pas:
b) ( abc + bca + cab ) / ( xyz + yzx + zxy ) =
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( 100a+10b+c + 100b + 10c + a + 100c+10a+b)
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(100x+10y+z+100y+10z+x+100z+10x+y)
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= ( 111 a + 111 b + 111 c ) / ( 111 x + 111 y + 111 z ) =
= 111 ( a + b + c ) /111(x+y+z) =
= (a+b+c)/(x+y+z)
