<
>
-0.2-0.3
$\frac {1} {2}$-2
=
-22
-1-2
2.5-2.5
$\frac {1} {2}$$-\frac {1} {2}$
-20
2.3$2\frac {1} {2}$
1005.6$1005\frac {1} {6}$
$-\frac {1} {10}$-10