3p(x+1)²y²+6p(x+1)²y+3p(x+1)
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3p(x+1)²y²+6p(x+1)²y+3p(x+1)
3p(x+1)²y²+6p(x+1)²y+3p(x+1)
3p(x+1)²y²+6p(x+1)²y+3p(x+1)
原式=3p(x+1)[(x+1)²y²+2(x+1)y+1]
=3p(x+1)[(x+1)y+1]²
=3p(x+1)(xy+y+1)²
3p(x+1)²y²+6p(x+1)²y+3p(x+1)
=3p(x+1)(xy^2+y^2+2xy+2y+1)