Toán Lớp 5: neu ta giam canh mot thua ruong hinh vuong di 3,5 m2 thi dien tich no giam la 78.75m2 .tinh dien tich dau thua ruong do
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Toán Lớp 5: neu ta giam canh mot thua ruong hinh vuong di 3,5 m2 thi dien tich no giam la 78.75m2 .tinh dien tich dau thua ruong do
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