Question

Aflati valoarea lui "a" ,apoi asezati rezultatele obtinute inordinea descrescatoare:

Answer 1

400-4a=80
4a=400-80
a=320:4
a=80

7a+40=180
7a=180-40
a=140:7
a=20

520-2a=500
2a=520-500
a=20:2
a=10

4a:5=80
4a=80x5
a=400:4
a=100

100;80;20;10