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datnhe202
2 năm trước
Tìm số hữu tỉ x trong tỉ lệ thức sau a) 0,81: x/2=16/x^4: (-0,9) b) x:y=3:2; y:z=2:1 và z:1=1:5/4 c) 7:(8.x)=10:y; 9:(2y)=5:(3.z); 10:z=9:4
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