Toán Lớp 6: (x-4)×(y+1)=8
(2x+3)×(y-2)=15
x×y+2x+y=12
x×y-x-3y=4
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Toán Lớp 6: (x-4)×(y+1)=8
(2x+3)×(y-2)=15
x×y+2x+y=12
x×y-x-3y=4
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