因式分解:25(x-2y)²-4(y-2x)²
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因式分解:25(x-2y)²-4(y-2x)²
因式分解:25(x-2y)²-4(y-2x)²
因式分解:25(x-2y)²-4(y-2x)²
原式=(5x-10y+2y-4x)(5x-10y-2y+4x)
=(x-8y)(9x-12y)
=3(x-8y)(3x-4y)
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25(x-2y)²-4(y-2x)²
=(5x-10y)^2-(4x-2y)^2
=[(5x-10y)-(4x-2y)][(5x-10y)+(4x-2y)]
=(x-8y)(9x-12y)
=[5(x-2y)]^2–[2(y-2x)]^2
=(5x-10y+2y-4x)(5x-10y-2y+4x)
=(x-8y)(9x-12y)
=3(3x-4y)(x-8y)
最后后面一个括号中3提出来 变成3*(x-8y) 所以最后原式=3(x-8y)(3x-4y)