Question

aflati valoarea lui x din proportia :
$\frac{1.5}{2.3} = \frac{x}{0.(3)}$

Answer 1

a)x•2,3=1,5•0,(3)
x•23/10=15/10•3/9
x•23/10=45/90
x•23/10=1/2
x=1/2:23/10
x=1/2•10/23
=> x=5/23
Verificare:5/23•23/10=1/2
15/10•3/9=45/90=1/2
=>x=5/23
b)1/2+4/5•10/9=1/2+40/45=45/90+80/90=125/90
6/5-3/4•5/6=6/5-15/24=6•24/120-15•5/120=144-75/120=69/120
125/90:69/120=125/90•120/69=125•4/3•69=500/207
500/207=1000/x
500x=207•1000
x=207•1000/500=>x=207•2=414

Verificare:500/207=1000/414
2,41=2,41