一根长1米直径16厘米的原木的体积为3.14*(16/2/100)^2*1=0.020096 (m³)1/ 0.020096=49.76=50 (根)
V = π(0.16/2)^2 * 1 = 0.0064π * 1 =0.0064π =1/0.0064/3.14 =50跟 记得采纳哥们
