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Aflati
numerele a, b, c, stiind ca:                                                                                                    

b : a = 3 r
4;                                                                                                                                    

c : b = 2 r
5;                                                                                                                                   
 
c – b =27.




Răspuns :

c=27+b

(27+b):b=2 r5
27+b=2b+5
27-5=2b-b
22=b

c-22=27, c=27+22, c=49

22:a=3 r4

22=3a+4
22-4=3a
18=3a
18:3=a
6=a

a=6, b=22, c=49
[tex]b\div a=3r 4[/tex] ⇒ [tex]b=3a+4[/tex]
[tex]c\div b =2r5[/tex] ⇒ [tex]c=2b+5[/tex]
[tex]c-b=27[/tex] ⇒ [tex]c=27+b[/tex]

[tex] \left \{ {{c=2b+5} \atop {c=27+b}} \right. [/tex] ⇒ [tex]2b+5=27+b[/tex] ⇒ [tex]2b-b=27-5[/tex] ⇒ [tex]\boxed {b=22}[/tex] ⇒ [tex]\boxed {c=49}[/tex]

[tex]22=3a+4[/tex] ⇒ [tex]3a=18[/tex] ⇒ [tex]\boxed {a=6}[/tex]