Biểu đồ sau biểu diễn dân số nước ta qua các năm:
Qua biểu đồ cho biết sau bao nhiêu năm (kể từ năm 2005) thì dân số nước ta tăng thêm 10 triệu người?
A.7 năm.
B.11 năm.
C.5 năm.
D.12 năm.

Điền giá trị còn thiếu vào bảng:
m
3
30
23
78 × m
A.234
B.2340
C.1794
D.

Chọn đáp án đúng:
Giá trị của biểu thức m × 39 với m = 15 là:
585
435
975
A.answer1
B.
C.
D.

Điền đáp án đúng vào ô trống
Tính:
 
1242 × 16 =
A.19872
B.
C.
D.

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