Răspuns :
Răspuns:27:[26+(6 Xa-7x3):9]+(13-2x2x3)=
27:[26+(6 xa-21):]+(13-12)
27:(26+6ax-21)+1
___
9
27:[26+3(2xa-7)]+1
---------
3
27:71+2 ax+1
------------
3
27x 3
------------- +1
71+2ax
81+71+2ax
---------------
71+2ax
Solutie: 152+2ax
-----------
71+2ax
Explicație pas cu pas:
Răspuns:
27:(26+(6a-21):9)+(13-12)=2
27:(26+[tex]\frac{6a-21}{9}[/tex])+1=2
27:(26+[tex]\frac{3(2a-7)}{9}[/tex])+1=2
27:(26+[tex]\frac{2a-7}{3}[/tex])+1=2
27:[tex]\frac{78+2a-7}{3}[/tex]+1=2
27:[tex]\frac{71+2a}{3}[/tex]+1=2
27×[tex]\frac{3}{71+2a}[/tex]+1=2
[tex]\frac{81}{71+2a}[/tex]+1=2
[tex]\frac{81}{71+2a}[/tex]=2-1
[tex]\frac{81}{71+2a}[/tex]=1
81=71+2a
-2a=71-81
-2a=-10
a=[tex]\frac{-10}{-2}[/tex]
a=5