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1800÷5×6290+186-84÷42491-(25+20)×4365×8×125×257×48+52×5769×[(580-445)÷9].

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答案和解析
(1)1800÷5×62,
=360×62,
=22320;

(2)90+186-84÷42,
=90+186-2,
=276-2,
=274;

(3)491-(25+20)×4,
=491-45×4,
=491-180,
=311;

(4)365×8×125×2,
=(365×2)×(8×125),
=730×1000,
=730000;

(5)57×48+52×57,
=(48+52)×57,
=100×57,
=5700;

(6)69×[(580-445)÷9],
=69×[135÷9],
=69×15,
=1035.