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rezolvatii in Q ecuatile: a). 7/3 x +2,5=x +4in faţa1/2=
b).0,(2)-5/6 x =7/9;


Răspuns :

Răspuns:

Explicație pas cu pas:

a). 7/3 x +2,5=x +4 1/2        x+4/3x+2,5=x+9/2   4x/3=4,5-2,5        4x/3=2

4x=6     x=1,5

b).0,(2)-5/6 x =7/9           2/9-5x/6=7/9      5x/6=2/9-7/9        5x/6=-5/9

x/6=-1/9    x=-6/9=-2/3

Răspuns:

7x/3+2,5=x+4 1/2

2,5=25/10=5/2

4 si 1/2=(4·2+1)/2=9/2

²⁾7x/3+³⁾5/2=⁶⁾x+³⁾9/2

14x+15=6x+27

14x-6x=27-15

8x=12=>x=12/8=>x=1,5

________________

0,(2)-5x/6=7/9

0,(2)=2/9

2/9-5x/6=7/9

-5x/6=7/9-2/9

-5x/6=5/9

5·6=-5x·9

-45x=30

x=-30/45

x=-2/3