June 2023 1 4 Report
СРОЧНО ПЖ
Розклади на множники (x+20y)2−(20x+y)2.

Обери правильну відповідь:

(x2+40xy+400y2)−(400x2+40xy+y2)
399(y2−x2)
(x2+400y2)⋅(400x2+y2)
інша відповідь
(−19x+19y)⋅(21x+21y)
−399x2+399y2
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