计算下面各题 - = + = + = 1- =

1. 计算下面各题
$\text{[math]}$ - $\text{[math]}$ =      $\text{[math]}$ + $\text{[math]}$ =    $\text{[math]}$ + $\text{[math]}$ =

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

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