(15.7÷3.14÷2)²×3.14×1.8×1/3÷1/3÷2.5×10000
=(5÷2)²×3.14×1.8÷2.5×10000
=2.5²×3.14×1.8÷2.5×10000
=2.5×3.14×1.8×10000
=141300
答:其底面面积是141300平方厘米.
(15.7÷3.14÷2)²×3.14×1.8×1/3÷1/3÷2.5×10000
=(5÷2)²×3.14×1.8÷2.5×10000
=2.5²×3.14×1.8÷2.5×10000
=2.5×3.14×1.8×10000
=141300
答:其底面面积是141300平方厘米.