If y varies directly as m and inversely as the square of n,a
If y varies directly as m and inversely as the square of n,and if y=8 when m=16 and n=1,then what is the value of y when m=8 and n=4? A 0.125 B 0.25 C 0.5 D 1 E 2 求讲解 书后答案是D
y varies directly as m and inversely as the square of n directly as就是正比 inversely as就是反比 如果答案不对就可能是我翻译错了 square of n应该是n的平方根 如果y跟m成正比,跟根号n成反比,前面加个系数k,就设成 y=k*m/根号n 已知y=8 when m=16 and n=1 所以k=0.5, 所以 y=0.5*m/根号n 那么当m=8,n=4时代入上式解出y=2