👤

a+b=17,4 a=b-21 a=? b=?


Răspuns :


[tex]a + b = 17.4[/tex]

[tex]a = b - 21[/tex]

[tex]b - 21 + b = 17.4[/tex]

[tex]b + b = 17.4 + 21[/tex]

[tex]2b = 38.4[/tex]

[tex]b = \frac{38.4}{2} [/tex]

[tex]b = 19.2[/tex]

[tex]a = b - 21[/tex]

[tex]a = 19.2 - 21[/tex]

[tex]a = - 1.8[/tex]









a+b =17.4
a =b-21

b-21 +b =17.4
2b =17.4+21
2b =38.4
b =19.2
a =19.2 -21 = -1.8