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show that the effective coefficient of linear thermal expansion is :

alpha= (a1L1+a2L2)/L

[- alpha/a=coefficient of linear thermal expansion]

i have no idea how to derive that equation, the only thing i no/learned from reading the book is that the equation for the coefficient of linear thermal expansion for one material is alpha=(delta L)/Lo(delta T)

anyone who can show me/drop some hints would be greatly appreciated.

thanks in advance