Question

найди корень уравнений. 7x+7=37-3x 9y=2y 16z-56=8z

Answer 1

$7x+7=37-3x$

 

$7x+3x=37-7$

 

$10x=30$

 

$x=30:10$

 

$x=3$

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$7cdot3+7=37-3cdot3$ (это проверка)

 

$21+7=37-9$

 

$28=28$

============================================

$9y=2y$

 

$9y-2y=0$

 

$7y=0$

 

$y=0$

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$9cdot0=2cdot0$

 

$0=0$

============================================

$16z-56=8z$

 

$16z-8z=56$

 

$8z=56$

 

$z=56:8$

 

$z=7$

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$16cdot7-56=8cdot7$

 

$112-56=56$

 

$56=56$

Answer 2

7х+7=37-3х

7х+3х=37-7

10х=30

х=30/10

х=3

проверка:

7*3+7=37-3*3

28=28

___________

16z-56=8z

16z-8z=56

8z=56

z=56/8

z=7

проверка:

16*7-56=8*7

112-56=8*7

56=56