(3x-2y-7)(3x+2y-7)
=[(3x-7)-2y][(3x-7)+2y]
=(3x-7)²-(2y)²
=9x²-42x+49-4y²
(3x-2x-7)(3x+2y-7)
(3x-2x-7)(3x+2y-7)
數(shù)學(xué)人氣：754 ℃時(shí)間：2020-05-17 13:38:33
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