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hoangmydung2001
2 năm trước
1. Cho 1 hình chữ nhật có diện tích 180 cm ² . Nếu giảm chiều dài xuống 3 lần , chiều rộng đi 2 lần thì được 1 hình vuông. Tính chu vi hình chữ nhật ? 2. 1 số trừ 2357 rồi cộng với 3083 thì được 6801 .Tìm số đó là (gợi ý tìm x) 3. 2 số cộng tổng bằng 140 nếu gấp số thứ nhất lên 5laanf và số thứ 2 lên 3 lần thì được tổng mới bằng 516 .Tìm số thứ 2
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