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maigiang
2 năm trước
cho manh bia hinh chu nhat co chu vi la 60cm , chieu dai gap doi chieu rong. tinh dien tich manh bia hcn ngta cat manh bia hcn thanh cac manh bia hinh vuonng bang nhau co canh 5cm. hoi cat duoc bao nhieu manh bia hinh vuong.
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