Question

Determina in x astfel incat a),2x-5,3=0,78 b)12-(x-1)=34 c)3,(2)+x mai mic decat 9(7) in N

Answer 1

a) 2x-5,3=0,78
2x=0,78+5,3
2x=6,08
x=3,04   nu are solutii in N

b)12-(x-1)=34
12-x+1=34
x=13-34=-21 nu are solutii in N


c)3,(2)+x < 9,(7)
3,(2)=(32-3)/9=29/9
9,(7)=(97-9)/9=88/9
29/9+x < 88/9
x < 88/9-29/9

x < 59/9
x={0,1,2,3,4,5}