Question

Rezolvati aceste ecuatii dau 20 de puncte
[0,8(3)x0,75-0,(3)]:3,5=
[2,(6)+0,2(7)x1,25]:6,5=

Answer 1

[0,8(3)x0,75-1,(3)]:3,5=
($\frac{75}{90}$x$\frac{75}{100}$-$1\frac{3}{9}$):3,5=
($\frac{5}{6}$x$\frac{3}{4}$-$\frac{1}{3}$):3,5=
[tex] (\frac{5}{8} - \frac{1}{3}) :3,5=[tex]
(15-8):3,5=
7:3,5=2

[2,(6)+0,2(7)x1,25]:6,5=
([tex] \frac{8}{3} + \frac{5}{18} x \frac{5}{4}:6,5= [tex]
[tex]( \frac{8}{3} + \frac{25}{72}) :6,5= [/tex]
(192+25):6,5=
217:6,5=$\frac{2170}{65}$=$\frac{434}{13}$

Answer 2

[0,8(3)×0,75-0,(3)]÷3,5=[ (83-8)/90× 75/100-1/3]÷ 35/10= (75/90×3/4-1/3)×2/7=
=(5/8-1/3)×2/7=(15-8)/24×2/7= 7/24×2/7=1/12



[2,(6)+0,2(7)x1,25]÷6,5=(24/9+25/90×125/100) ×10/65=(8/3+5/18×5/4)×2/13=
=(8/3+25/72)×2/13=(192+25)/72×2/13=217/72×2/13= 217/468