+ = + =

1.
$\text{[math]}$ + $\text{[math]}$ =      $\text{[math]}$ + $\text{[math]}$ =       $\text{[math]}$ - $\text{[math]}$ =       $\text{[math]}$ + $\text{[math]}$ =
1- $\text{[math]}$ =        $\text{[math]}$ - $\text{[math]}$ =       $\text{[math]}$ - $\text{[math]}$ =        $\text{[math]}$ - $\text{[math]}$ =