Chào mn ạ mn có thể giúp mk giải các bài tập này ko ạ mk cần gấp lắm mong các bn ủng hộ cho mk nha Mk cảm ơn trc nha 
I bài tập 
Bài 1 : Có 2975 quyển sách xếp đều vào 7 ngăn . Hỏi ngăn 9 như thế xếp đc bao nhiêu quyển sách 
Bài 2 : Môt hình vuông có diện tích là 81 cm vuông . Chu vi hình vuông đó là bao nhiêu cm ?
Bài 3 : Mẹ mua 12 quả cam . Mẹ biếu bà 3 quả , mẹ để dành cho bố 1 quả . Số còn lại mẹ chia đều cho hai anh em . Hỏ mỗi anh em đc bao nhiêu quả cam ?
Bài 4 : Xe thứ nhất chở 36 bao gạo , xe thứ 2 chở gấp 3 lần xe thứ nhất . Hỏi cả hai xe chở đc bao nhiêu bao gạo ?
Bài 5 : Một hình vuông có diện tích 36 cm vuông . Chu vi của hình vuông là bao nhiêu cm ?
Bài 6 : 20 tâng lên 4 lần , rồi lại giảm đi 2 lần cuối cùng là số nào ?
Bài 7 : Một cửa hang , ngày thứ nhất bàn đc 12 560 kg bắp . Ngày thứ hai bàn đc ½ số bắp ngày thứ nhất  .Hỏi cả hai ngày đó bàn đc bao nhiêu kg bắp ?
Bài 8 : 45 Chiêc ghế đc xếp thành 5 hàng . Hỏi 63 chiếc ghế như thế xếp thành mấy hàng  ?
II Trắc nghiệm 
Câu 1 : Hình vuông có cạnh 3dm . Diện tích hình vuông là 
A.6cm vuông 
B. 9cm
C.9cm vuông 
D.12cm 
Câu 2 : 2m 2cm = ….cm . 
A.4cm
B.22cm
C.202cm
D.220cm
Câu 3 : Lan có 5000 đòng . mai có số tiền gấp 3 lần sô tiền của Lan . Vậy số tiền Mai có là :
A.8000đ
B.3000đ
C.15 000đ
D.18 000đ

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