是144y^4
原式=x^4-24x²y²+144y^4-x²y²
=(x²-12y²)²-x²y²
=(x²+xy-12y²)(x²-xy-12y²)
=(x+4y)(x-3y)(x-4y)(x+3y)
x*4-25x*2y*2+144y*2
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