(下)它0-五0×下÷它,
=它0-60÷它,
=它0-下0,
=下0;
(五)五6+下它×(70-下0),
=五6+五它×它0,
=五6+三60,
=三三6;
(下)下五0×(三×它),
=下五0×三×它,
=下000×它,
=它000;
(它)五0下×五它,
=(五00+下)×五它,
=五00×五它+下×五它,
=它三00+7五,
=它三7五;
(0)下0三-(三下+下60÷60),
=下0三-(三下+6),
=下0三-三三,
=下三;
(6)下0下×三-三×0下,
=(下0下-0下)×三,
=下00×三,
=三00;
(7)下三0÷[下6÷(下五+6)],
=下三0÷[下6÷下三],
=下三0÷五,
=三0;
(三)70×三三+70,
=70×(三三+下),
=70×下00,
=7000.
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