Răspunsuri

2014-09-28T20:15:11+03:00
1+2+3+...+124
124+123+122+...+1                 adunam cele 2 relatii

125+125+125+...+125        sunt 124 de termeni

2s= 125*124
s=125*124:2
s=7750

b=2x(1+2+3+...+124)+125
b=2*7750+125
b=15500+125
b=15625

2014-09-28T20:19:46+03:00
B= 2×124×125/2 + 125 = 124×125 + 125 = 125(124+1) = 125²= (5³)² =(5²)³ =25³ = cub perfect