September 2021 1 6 Report
Докажите, что все значения выражений при всех x и y равны 0:
а) -(2x - 3y)² + (2x - 3y)(2x + 3y) + 6y(3y -2x)
б) (6x - 7)² - 4(3x + 1)² + 9(12x - 5)
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