Question

Пример:99²
(100-1)²=100²-2×100×1+1²=10000-200+1=9801​

Answer 1

Ответ:

(1000+1)²=1000²+2*1000*1+1²=1000000+2000+1=1002001

(10+1)²=10²+2*10*1+1²=100+20+1=121

(20+1)²=20²+2*20*1+1²=400+40+1=441

(20-1)²=20²-2*20*1+1²=400-40+1=361

(30-1)²=30²-2*30*1+1²=900-60+1=841

(50-1)²=50²-2*50*1+1²=2500-100+1=2401