Question

Afla toate numerele naturale pentru ca fiecare inegalitate sa fie adevarata :
a+369<379 
a -915 <4
897- a >895 
394 - a >389

Answer 1

a+369<379|-369
a<10=> a∈{1.2.3.4.5.6.7.8.9}

a-915<4|+915
a<919=>a∈{1,2,3......,917,918}

897-a>895 
a>897-895
a>2=>a∈{3,4,5,.....}

394-a> 389
a>394-389
a>5=>a∈{6,7,8,9,.....}