Trung bình cộng của ba số là 112,3. Tính tổng ba số đó.
A. $ 236,9 $ .
B. $ 336,9 $ .
C. $ 112,3 $ .
D. $ 37,5 $ .

Điền giá trị còn thiếu vào bảng sau:
Thừa số
30,56
15
234
Thừa số
4,3
0,01
Tích
120,75
A.8,05
B.131,408
C.2,34
D.

Điền đáp án đúng vào chỗ trống:
Tính nhẩm
1505 : 10 =
1505 : 100 =
1505 : 1000 =
A.150,5
B.15,05
C.1,505
D.

Nối biểu thức với giá trị tương ứng:
(4,56 + 2,76) × 4 
(100 - 25,5) : 5
10,4 + 1,89 × 8
25,52
14,9
29,28
Làm lại
A.13
B.22
C.31
D.

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