4xy(5/12x^2-3xy-1/4y^2)
1个回答
4xy(5/12x^2-3xy-1/4y^2)
=(4*5/12)x^(2+1)y-(4*3)x^(1+1)y^(1+1)-(4*1/4)xy^(1+2)
=5/3x^3y-12x^2y^2-xy^3
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