Răspuns:
pt 100: 100-10000-1000000-100000000
pt 200:200-40000-8000000-1600000000
pt 300:300-90000-27000000-8100000000
pt 400:400-160000-64000000-25600000000
Explicație pas cu pas:
400 la a 4 = 4 la a 4 plus 100 la a 4
