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Tìm x, y, z biết : 1. x/7=7/x 2.x-2/5=3/8
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Tìm x, y, z biết : 1. x/7=7/x 2.x-2/5=3/8

User Juhist
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1. x.x=7.7 (nhân chéo)
<=>x^2 = 49
<=>x = 7
2. x= 31/40
User Dgarbacz
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