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2 năm trước
Tìm x Mỗi số hạng của một tổng=tổng trừ đi số hạng đã biết Mỗi tổng của 1 tích bằng tích chia cho thừa số đã biết Nếu một tích của hai thửa số mà bằng 0 thì ít nhất có một thửa số bằng 0: Nếu a.b=0thì a=0 hoặc b=0
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