August 2021 1 16 Report
1)Вычислите 9,9², используя формулу квадрата разности.
2)Вычислите значение выражения 504²-502²
3)Упростите выражение:
(2y-1)(1+4y+y²)+(1-2y)(1+6y+y²)+4y²
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