[1-(1/4-0.1÷2)]×5/13

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[1-(1/4-0.1÷2)]×5/13

[1-(1/4-0.1÷2)]×5/13
[1-(1/4-0.1÷2)]×5/13

[1-(1/4-0.1÷2)]×5/13
(1/4-0.1÷2)*5/13
=(1/4-1/20)*5/13
=1/4*5/13-1/20*5/13
=5/52-1/52
=1/13