Ответ:
Объяснение:
4x²-20xy+25y²=(2x²)-2*2x*5y+(5y)²=(2x-5y)²≥0.
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Ответ:
Объяснение:
4x²-20xy+25y²=(2x²)-2*2x*5y+(5y)²=(2x-5y)²≥0.