Question

1) (327х - 5295) : 57 = 389;2) ( 27х + 11) * 315 = 11 970;

Answer 1

1) $(327x-5295):57=389$

 

 $327x-5295=389\cdot57$

 

$327x-5295=22173$

 

$327x=22173+5295$

 

$327x=27468$

 

$x=27468:327$

 

$x=84$

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$(327\cdot84-5295):57=389$ (это проверка)

 

$(27468-5295):57=389$

 

$22173:57=389$

 

$389=389$

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2) $(27x+11)\cdot315=11970$

 

$27x+11=11970:315$

 

$27x+11=38$

 

$27x=38-11$

 

$27x=27$

 

$x=27:27$

 

$x=1$

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$(27\cdot1+11)\cdot315=11970$

 

$(27+11)\cdot315=11970$

 

$38\cdot315=11970$

 

$11970=11970$