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ctu162
2 năm trước
tìm x,y,z a, 3/7-0.2x=1,25 b, 5-|0,4x-1| =3 c , x/2=y/3=z/5 và x mũ 2 +2y mũ 2 -2 mũ 2 = -12 ( ai làm câu nào cx đc ạ)
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