Răspuns :
a) x/4=3/2
2x=4*3
2x=12
x=6
b) 2/10=4/x
2x=4*10
x=2*10
x=20
c) 2/(x+1)=3/(x+2)
2 (x+2)=3 (x+1)
2x+4=3x+3 ...../-(2x+3)
1=x
2x=4*3
2x=12
x=6
b) 2/10=4/x
2x=4*10
x=2*10
x=20
c) 2/(x+1)=3/(x+2)
2 (x+2)=3 (x+1)
2x+4=3x+3 ...../-(2x+3)
1=x