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二元一次方程3x+y=10有無數組解,有3組正整數解. y=10-3x則一組特解x0=1 => y0=7 通解x=x0+n x=1+n y=y0-3n => y=7-3n(n屬於N*) ∵x>0 & y>0 => 1+n>0 & 7-3n>0 => -1
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