b) `(-5/17).31/33+(-5/17).2/33+2 5/17`

=`-5/17.(31/33+2/33)+39/17`

=`-5/12.1+39/17`

=`34/17`

=`2`

c) `1/2. sqrt64 - sqrt {4/25}+1^0`

=`1/2.8-2/5+1`

=`4-2/5+1`

=`23/5`

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