Question

urgent va rog si 1 si 2

Answer 1

Răspuns:

Explicație pas cu pas:

1. a=12; b=36

a/b=12/36=12/3·12=1/3

b/(a+b)=36/(12+36)=36/48=3·12/4·12=3/4      

2. a) x/9=0,(3)/4  ⇔x=[9·0,(3)]/4=(9·3/9)4=3/4

x=3/4

b) 7/(x+1)=2,1/3  ⇔(x+1)=7·3/2,1  ⇔(x+1)=21/2,1  ⇔(x+1)=10  ⇔x=10-1=9  

x=9