September 2021 0 4 Report
В каком случае выражение преобразованно в тождественно равное? a) 2 (a - b) = 2a - b
b) (2 + a) (a - 2) = 4 - a2
с) (a + 2)2 = a2 + 4a + 4
d) ( a - b)2 = a2 - b2
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