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(2/3a-4/5y)²= 4/9a²-16/15ay+16/25y²
(2x² - 5)²=(2x²)²-2*2x²*5+5²=2x⁴-20x²+25
i
(2/3a - 4/5y)² =(2/3a)²-2*(2/3a)*(4/5y)+(4/5y)²=
=4/9a²-16/15ay+16/25y²