(5x-2y)²-(5x+2y)²
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(5x-2y)²-(5x+2y)²(5x-2y)²-(5x+2y)²(5x-2y)²-(5x+2y)²原式=25x²-20xy+4
(5x-2y)²-(5x+2y)²
(5x-2y)²-(5x+2y)²
(5x-2y)²-(5x+2y)²
原式=25x² - 20xy + 4y² - 25x² - 20xy - 4y²
= - 20xy - 20xy
= - 40xy