Daca 0,24•a/4,5 = 0,32/0,3 se cere a+12/12

Răspuns :

24/100×a/45/10=32/100/3/10
24/100×a/45/10=32/100×10/3
24/100×a/45/10=320/300
24/100×a=320/300×45/10
24/100×a=96/20
a=24/100×20/96
a=1/(5×4)
a=1/20

a+12/12=1/20+1 amplificãm pe 1 cu 20
1/20+20/20=21/20

[tex]0,24\cdot\dfrac{a}{4,5}=\dfrac{0,32}{0,3}[/tex]

0,24= [tex]\dfrac{24}{100}[/tex]= [tex]\dfrac{6}{25}[/tex]

[tex]\dfrac{a}{4,5}[/tex]= [tex]\dfrac{10a}{45}[/tex]= [tex]\dfrac{2a}{9}[/tex]

0,32= [tex]\dfrac{32}{100}[/tex]= [tex]\dfrac{8}{25}[/tex]

0,3= [tex]\dfrac{3}{10}[/tex]

[tex]\dfrac{6}{25}[/tex]· [tex]\dfrac{2a}{9}[/tex]= [tex]\dfrac{\frac{8}{25}}{\frac{3}{10}}[/tex]

[tex]\dfrac{2}{25}[/tex]· [tex]\dfrac{2a}{3}[/tex]= [tex]\dfrac{8}{25}[/tex]· [tex]\dfrac{10}{3}[/tex]

[tex]\dfrac{4a}{75}[/tex]= [tex]\dfrac{80}{75}[/tex]

4a= [tex]\dfrac{80\cdot 75}{75}[/tex]

4a=80

a= [tex]\dfrac{80}{4}[/tex]=20

[tex]\dfrac{a+12}{12}[/tex]= [tex]\dfrac{20+12}{12}[/tex]= [tex]\dfrac{32}{12}[/tex]= [tex]\dfrac{8}{3}[/tex]