Question

simplify 640➗80✖️4➖4 of 20➕639➖72➗9

Answer 1

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USING BODMASS RULE
=640➗80✖️4➖4 of 20➕639➖72➗9

=80*4-4*20+639-8
=320-80+639-8
=240+631
=871