Question

реши уровнения. 879-а=405 у×4=720 580:х=20 с+30=123 820-а=157 с×4=640

Answer 1

1. 879-a=405
a=879-405=474

2. 4y=720
y=720÷4=180

3.580÷x=20
x=580÷20=29

4. c+30=123
c=123-30=93

5.820-a=157
a=820-157=663

6.4c=640
c=640÷4=160

Answer 2

1) 879-405=474
2) 720÷4=180
3) 580÷20=29
4) 123-30=93
5) 820-157=663
6) 640÷4=160