Решите уравнения.
7x+2x=27 7x-5x=70 x+123=562
16x-4x=60 4x+12x=20+12 621-x=235

Ответ:

[tex]7x + 2x = 27 \\ 9x = 27 \\ x = 27 \div 9 \\ x = 3[/tex]

[tex]7x - 5x = 70 \\ 2x = 70 \\ x = 70 \div 2 \\ x = 35[/tex]

[tex]x + 123 = 562 \\ x = 562 - 123 \\ x = 439[/tex]

[tex]16x - 4x = 60 \\ 12x = 60 \\ x = 60 \div 12 \\ x = 5[/tex]

[tex]4x + 12x = 20 + 12 \\ 16x = 32 \\ x = 32 \div 16 \\ x = 2[/tex]

[tex]621 - x = 235 \\ - x = 235 - 621 \\ - x = - 386 \\ x = - 386 \div - 1 \\ x = 386[/tex]

Пошаговое объяснение:

7х+2х=27

9х=27

Х=27:9

Х=3

7х-5х=70

2х=70

Х=70:2

Х=35

Х+123=562

Х=562-123

Х=439

16х-4х=60

12х=60

Х=60:12

Х=5

4х+12х=20+12

16х=32

Х=32:16

Х=2

621-х=235

-х=235-621

-х= - 386

Х=386