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)²2
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
25(x-2y)²-4(y-2x)²
=[5(x-2y)+2(y-2x)][5(x-2y)-2(y-2x)]
=(x-8y)(9x-12y)
=3(x-8y)(3x-4y)
答:
25(x-2y)²-4(y-2x)²
=[5(x-2y)]²-[2(y-2x)]²
=(5x-10y)²-(2y-4x)²
=(5x-10y+2y-4x)(5x-10y-2y+4x)
=(x-8y)(9x-12y)
=3(x-8y)(3x-4y)