Exponent 8 bit, Significand 9 

Bias 2^(8-1)-1 = 127

A. Normalized maximum

0 11111110 111111111

1     1
1     3
1     7
1    15

1    31
1    63
1   127
1   254   254-127 = 127 unbiased exponent

Significand with hiddent bit resored.
1.1111 1111 1

1.111111111 = 10.000000000 - 0.000000001 =   2^1 - 2^-9

 (2^1 - 2^-9)*2^127 = 2^128 - 2^118

B. Normalized minimum

0 0000 0001  0000 00000

Unbias  1 - 127 = -126 

1.000000000 * 2^-126 = 1 * 2^-127 

C. Denormalized minimum

0 0000 0000  0000 0000 1

2^-9 * 2^-126 = 2^-135