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Aflati numarul x, string ca a-b=6 si x•a-x•b+9•a-9•b=654

Răspuns :

[tex]a - b = 6[/tex]

[tex]xa - xb + 9a - 9b = 654[/tex]

[tex]x(a - b) + 9(a - b) = 654[/tex]

[tex]x\times 6 + 9 \times 6 = 654[/tex]

[tex]6(x + 9) = 654 \: | \div 6[/tex]

[tex]x + 9 = 109[/tex]

[tex]x = 109 - 9[/tex]

[tex]x = 100[/tex]

xa-xb +9a-9b =654

x(a-b ) + 9(a-b ) =654

x*6  +  9*6 = 654

6x =654- 54

6x =600

x =100