Răspuns :
2×1+2×3+2×5+2×7+2×9 = 2× ...
2+2×3+2×5+2×7+2×9 = 2× ...
2+6+2×5+2×7+2×9 = 2× ...
2+6+10+2×7+2×9 = 2×...
2+6+10+14+2×9 = 2×...
2+6+10+14+18 = 2×...
8+10+14+18 = 2×...
18+14+18 = 2×...
32+18 = 2×...
50 = 2×25
2+2×3+2×5+2×7+2×9 = 2× ...
2+6+2×5+2×7+2×9 = 2× ...
2+6+10+2×7+2×9 = 2×...
2+6+10+14+2×9 = 2×...
2+6+10+14+18 = 2×...
8+10+14+18 = 2×...
18+14+18 = 2×...
32+18 = 2×...
50 = 2×25