18/19*15/17+15/19*16/17

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18/19*15/17+15/19*16/17

18/19*15/17+15/19*16/17
18/19*15/17+15/19*16/17

18/19*15/17+15/19*16/17
18/19*15/17+15/19*16/17
=18/19*15/17+16/19*15/17
=15/17*(18/19+16/19)
=15/17*34/19
=30/19

=15/17(18/19+16/19)
=15/17*34/19
=510/323
=30/19