Su Jiaoban fifth grade second volume mathematics supplementary exercise 88 pages answer.

1.2× 4× 3.14 = 25.12m, (2÷2)2×3. 14=3. 14 (square centimeter).

2. (Draw a circle with (3,2) as the center in the grid diagram. The radius of the circle is 2cm. Draw the diameter AB and the radius OC, and indicate the positions of A, B and C with several pairs. )

3.28.26÷3. 14÷2=4.5 (m), 4.52×3. 14=63.585 (m2).

Its area is 63.585 square meters.

4.1.5× 3.14× 300× 60 = 84780 (m) =84.78 (km)

A: The speed of this train is about 84.78 kilometers per hour.

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