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Chứng minh rằng ta có A-(A-B)=B khi và chỉ khi B ⊂ A

Chứng minh rằng ta có A-(A-B)=B khi và chỉ khi B ⊂ A
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Chứng minh rằng ta có A-(A-B)=B khi và chỉ khi B ⊂ A

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User Polis
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When converted to a household measurement, 9 kilograms is approximately equal to a
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