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The answer on page 40 of the sixth grade mathematics synchronization volume II
1, 3.14 * 3 * 3 *1.5 *1= 42.39 (ton)

2,3. 14 *(6.28÷3. 14÷2)* 4 = 12.56(cc) 12.56 cc = 12.56ml。

3. (9 * 7 * 3+5 * 5 * 5) ÷ [3.14 * (10 ÷ 2) squared ]=4 (cm).

4, (63÷6)*(25÷6)=40 (cans)

5, 2 * 3.14 * 0.6 * 20 * 5 * 0.3 =113.04 (kg)