Question

Determinati x astfel încat :
a) 12-(x-1)=2,4


b) 3,(2)+x<9,(7) în N

Answer 1

$\displaystyle a).12-(x-1)=2,4 \\ 12-x+1=2,4 \\ -x=2,4-12-1 \\ -x=-10,6 \\ x=10,6 \\ b).3,(2)+x\ \textless \ 9,(7) \\ \frac{29}{9} +x\ \textless \ \frac{88}{9} \\ x\ \textless \ \frac{88}{9} - \frac{29}{9} \\ x\ \textless \ \frac{59}{9} \\ x\ \textless \ 6,(5) \\ x \in \{0;1;2;3;4;5;6\}$