擅长因式分解的高手帮下忙.-9x²y+3xyzx(y-z)-y(z-y)81x四次方-y的四次方m²+7m-18(x+y)²+2(y+x)+1121(a-b)²-169(a+b)²5x²+6xy-8y²-a³-4a²+12a(a²+4)²-16a²4x²(a-b)+16y²(
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