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A=4/5-(7/10-5/6)

=4/5-(41/60-50/60)

=4/5-(-8/60)

=4/5+8/60

=48/60+8/60

=56/60=14/15

B=3/18+5/11×77/15

=3/18+385/165

=3/18+7/3

=3/18+42/18

=45/18=5/2

C=5/9÷(5/9+1/6)

=5/9÷(30/54+9/54)

=5/9÷39/54

=5/9÷13/18

=5/9×18/13

=5×2/13

=10/13