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kimhang110120130
3 năm trước

Tìm x,y thuộc Z sao cho : 6xy - 9y - 2 - 2x =0

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taihop60
3 năm trước

Đáp án:

Giải thích các bước giải:

6xy−9y−2−2x=0

<=>(6xy−2x)−(9y−3)−5=0

<=>(2x−3)(3y−1)=5

Ta có 5=1.5=(-1)(-5)

TH1 2x−3=1,3y−1=5<=>x=2,y=2(TM)

TH2 2x−3=5,3y−1=1<=>x=4,y=23( loại)

TH3 2x−3=−5,3y−1=−1<=>x=−1,y=0(TM)

TH4 TH2 2x−3=−1,3y−1=−5<=>x=1,y=−43(loại)

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