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tieuthumituot208
2 năm trước
Tìm x,y E Z biết: a. ( 2x-1)( y-4 )= -13 b. ( 5x +1 )( y-1)=4 c. Xy - 3x = -19 d. 5xy – 5x + y = 5 e. | x + 25 | + | -y + 5 | = 0 f. | x - 40 | + | x - y + 10 | = 0
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