4×3. 14× 1 1

= 16×3. 14× 1 1

= 552.64

2: 0.6÷2=0.3

3. 14×0.3× 1

=3. 14×0.09× 1

=0.2826

50÷0.2826≈ 177

3. The first 25. 12÷3. 14÷3=4.

4×3. 14

= 16×3. 14

=50.24

The second 18.84÷3. 14÷2=3.

3×3. 14

=9×3. 14

28.26

4: 6÷2=3

3×3. 14×7÷3+3×3. 14× 12÷3

=9×3. 14×7÷3+9×3. 14× 12÷3

=3. 14×9÷3×﹙7+ 12﹚

=3. 14×9÷3× 19

= 160. 14 )

5: The bottom area is 10×2÷5÷2=2.

3. 14×2

=3. 14×4

= 12.56

Volume 12.56×5÷3≈20.93

3 1ye 1: solution: ...

3. 14× 10x = 3. 14×30×5

3. 14× 100x = 3.14× 900× 5 (both sides are divided by 3.14×100).

x=45

2: 756.5÷ 1068× 120

=85

3: 5×4×2=40

320÷20×40=640

Suppose the rice bottom is 9.42 meters long and 0.6 meters high.

When the cone is not on the corner, its bottom circumference is

9.42 ÷ 3× 4 =12.56m.

12.56×2×0.6÷3

= 12.56×4×0.6÷3

=2.5 12

5: Ellipsis

You will be smart if you do it independently in the future ~ ~ ~ You can do it! Trust me! ! ! ! ! It's not easy for me either. Adopt it ~ ~ ~