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
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