1 48÷(1-25%)=64(吨)
2 S侧=πdh=6π×2=37.68(cm^2)
S表=S侧+2π(d/2)^2=12π+18π=30π=94.2(cm^2)
V=πr^2h=1/4πd^2h=18π=56.52(cm^3)
3 甲乙两地实际距离为
20×2000000=40000000cm=400000m=400km
1 48÷(1-25%)=64(吨)
2 S侧=πdh=6π×2=37.68(cm^2)
S表=S侧+2π(d/2)^2=12π+18π=30π=94.2(cm^2)
V=πr^2h=1/4πd^2h=18π=56.52(cm^3)
3 甲乙两地实际距离为
20×2000000=40000000cm=400000m=400km