3. 1) A ( adevarat )
2) A ( adevarat )
3) F ( fals )
4) A ( adevarat )
5) F ( fals )
4. a) 865 + 5 = 870
b) 865 × 5 = 4325
c) 865 - 5 = 860
5. 2742 × 3 + 1774 = 8226 + 1774 = 10000
6. 490 = 70 × 7
490 = 230 + 260
490 = 500 - 10
7200 = 72 × 100
7200 = 6800 + 400
7200 = 8000 - 800
6000 = 60 × 100
6000 = 5000 + 1000
6000 = 8999 - 2999
7. ( 98 × 89 + 1276 ) - 9998 =
( 8722 + 1276 ) - 9998 =
9998 - 9998 =
= 0
Sper ca te-am ajutat !