q*L^4/8AB-R*L^3/3AB=R/(AB/L^3) 如何算出R=3qL/2?
回答 (3)
2016-05-07 12:26 pm
✔ 最佳答案
SolQL^4/(8AB)－R*L^3/(3AB)=R/(AB/L^3)
QL^4/(8AB)－R*L^3/(3AB)=RL^3/(AB)
(24AB/L^3)[Q*L^4/(8AB)－R*L^3/(3AB)]=(24AB/L^3)RL^3/(AB)
24[QL/8－R/3]=24R
3QL－8R=24R
3QL=32R
R=3QL/32
2016-05-21 6:06 am
Q(L^4)/(8AB)-R(L^3)/(3AB)=R/(AB/L^3)
3Q(L^4)/(24AB)-8R(L^3)/(24AB)=R(L^3)/(AB)
[3Q(L^4)-8R(L^3)]/24=R(L^3)
3QL-8R=24R
3QL=32R
R=3QL/32
3Q(L^4)/(24AB)-8R(L^3)/(24AB)=R(L^3)/(AB)
[3Q(L^4)-8R(L^3)]/24=R(L^3)
3QL-8R=24R
3QL=32R
R=3QL/32
2016-05-07 1:09 pm
Q*L^4/8AB-R*L^3/3AB = R/(AB/L^3)
Q*L^4/8AB = R*L^3/AB +1/3(R*L^3/AB)
Q*L^4/8AB = 4/3(R*L^3/AB)
L^3/AB(Q*L/8) = L^3/AB(4/3)R
Q*L/8 = (4/3)R
∴ R=3QL/32
# [你的答案：R=3qL/2 , 是 分母漏了個 3 字嗎?]
Q*L^4/8AB = R*L^3/AB +1/3(R*L^3/AB)
Q*L^4/8AB = 4/3(R*L^3/AB)
L^3/AB(Q*L/8) = L^3/AB(4/3)R
Q*L/8 = (4/3)R
∴ R=3QL/32
# [你的答案：R=3qL/2 , 是 分母漏了個 3 字嗎?]
收錄日期: 2021-04-18 14:47:26
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