x+3y-3xy-1(因式分解)
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x+3y-3xy-1(因式分解)
x+3y-3xy-1(因式分解)
x+3y-3xy-1(因式分解)
(x-1)-3y(x-1)
=(x-1)(1-3y)
(3y-1)(1-x)
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