Question

115-6*X=73 (4900/Y-280)/60=7

Answer 1

$115-6x=73$

 

$6x=115-73$

 

$6x=42$

 

$x=42:6$

 

$x=7$

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$115-6cdot7=73$ (это проверка)

 

$115-42=73$

 

$73=73$

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$(4900:y-280):60=7$

 

$frac{4900:y-280}{60}=frac{7}{1}$

 

$4900:y-280=7cdot60$

 

$4900:y-280=420$

 

$4900:y=420+280$

 

$4900:y=700$

 

$frac{4900}{y}=frac{700}{1}$

 

$y=4900:700$

 

$y=7$

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$(4900:7-280):60=7$

 

$(700-280):60=7$

 

$420:60=7$

 

$7=7$