Răspuns:
7000 + 600 + 30 + 9 = (7×1000)+(6×100)+(3×10) + (1×9) = 7639
4000 + 300 + 20+7=(4×1000)+(3×100)+(2×10)+(1×7)=4327
8 000 + 500 + 80 + 2 = (8×1000)+(5×100)+(8×10)+(1×2) =8582
2000 + 700 + 80 + 4 = (2×1000)+(7×100)+(8×10)+(1×4)
Explicație pas cu pas:
Succes!