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[(79•8-261)•5+3(473-11•42)]•10-9•21

Răspuns :

[(632-261)5+3(473-462)]10-189=(371*5+3*11)10-189=(1855+33)10-189=1888*10-189=18880-189=18691
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=[(632-261)x5+3(473-462)]x10-9x21
=(371x5+3x11)x10-9x21
=(1855+33)x10-9x21
=18888x10-9x21
=18888-189
=18691