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Find out the solving process of Jiangsu college entrance examination math problem 20 1 1,1.
10.(e 1-2e 2)(ke 1+E2)= 0k+cos 2/3π-2k cos 2/3π-2 = 0

k- 1/2+k-2=0 2k=5/2 k=5/4

1 1. 1-a-( 1+a)= 2a

a & lt0， 1-a >； 1+a 1-a > 1 1+a & lt； 1 f( 1-a)= f( 1+a)

- 1+a-2a = 2( 1+a)+a 4a =-3a =-3/4

a & gt0， 1-a

So a=-3/4

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