Question

Реши уравнения:
а) х + ( 1200 - 900 ) = 1500
б) (50*30) : y = 15
в) c : (1200 : 2 ) = 3 
Заранее благодарна  

Answer 1

а) х+(1200-900)=1500

х+300=1500

х=1500-300

х=1200

 

б)(50*30):у=15

1500:у=15

у=1500:15

у=100

 

в)с:(1200:2)=3

с:600=3

с=600*3

с=1800

 

Answer 2

а) $x+(1200-900)=1500$

 

$x+300=1500$

 

$x=1500-300$

 

$x=1200$

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$1200+(1200-900)=1500$ (это проверка)

 

$1200+300=1500$

 

$1500=1500$

==============================================
б) $(50cdot30):y=15$

 

$1500:y=15$

 

$y=1500:15$

 

$y=100$

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$(50cdot30):100=15$

 

$1500:100=15$

 

$15=15$

==============================================
в) $c:(1200:2)=3$

 

$c:600=3$

 

$c=3cdot600$

 

$c=1800$

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$1800:(1200:2)=3$

 

$1800:600=3$

 

$3=3$