(1)...
p=1=>y=2 iar x=3 => 32 <50 nu ne convine
p=2=>y=4 iar x=5 => 54 > 50 admis
p=3=> y=6 iar x=7 =>76 >50 ,,
p=4=> y=8 iar x=9 => 98>50 ,,
R: 5o< (54;76;98)<100
(2)... zeci sute mii zeci sute mii
(-) 7590 7500 7000 (+) 7600 7600 7000
276750 276700 276000 276750 276800 28000
7283680 7283600 7283000 7283690 7283700 7284000
29796500 29796800 29796000 29796500 2979600 29797000