(77838+3702): (280*804-224214)*30+80 5207*96+4571040: 534-(900*4000-3093468)

(77838+3702):(280*804-224214)*30+80=81540:906*30+80=2780;

5207*96+4571040:534-(900*4000-3093468)=499872+8560-506532=1900

(77838+3702):(280*804-224214)*30+80=81540:(225120-224214)*30+80=

=81540:906*30+80= 90*30+80=2780

5207*96+4571040:534-(900*4000-3093468)=499872+8560-32906532=

= -32398100