Question

Cerinta: Aflati x din proportiile. Doar punctele: d,e,f,g,h..dau coroana! urgent va rog!!

Answer 1

D) x=3
E) x=3/2
F) x=1/7
G)x=4
H)x=15/12

Answer 2

d) 3×(3x-7)=5×(2x-6)
   9x-21=10x-30
   9x-10x=-30+21
     -x=-9=>x=9

e)3×(3x+8)=5×5x
    9x+24=25x
    9x-25x=-24
    -16x=-24
         x=-24/-16 (care se simplifica cu 8 )
         x=3/2

f) 0,(6)=6/9 care se simplifica cu 3=1/3
   2 intregi si 1/3=2×3+1/3=7/3
deci exercitiul va deveni

x:1/2=1/3:7/3
x ori2=1/3 ori 3/7
2x=1/7=>x=1/7:2=>x=1/7 ori 1/2=> x=1/14

g) 3 intregi si 1/3=3×3+1/3=10/3
3-1/3 aduc la acelasi numitor =3×3-1/3=9-1/3=8/3
1+1/2ori4/5=1+4/10 (dar 4/10 se simplifica cu 2)=1+2/5 aduc la acelasi numitor=1×5+2/5=5+2/5=7/5
7/7/5=7:7/5=7 ori5/7=5
acum exercitiul va deveni
10/3:8/3=5/x
10/3 ori 3/8=5/x
10/8=5/x=>x=8 ori 5/10=>x=40/10=>x=4

h)2-1/2 aduc la acelasi numitor=2 ori2-1/2=4-1/2=3/2
exercitiul devine
5/6=x:3/2
5/6=2x/3=>6 ori 2x=5 ori3=>12x=15=>x=15/12 care se simplifica cu 3=>x=5/4