Răspuns:
a) 89x8-(324-54x3)-42x5-3=
89x8-(324-162)-42x5-3=
89x8-162-42x5-3=
712-162-210-3=
550-210-3=
340-3= 337
b) 35x10+2x3x18-(23x2+7)=
35x10+2x3x18-(46+7)=
35x10+2x3x18-53=
350+6x18-53=
350+108-53=
458-53= 405
c) (13+12x7)x9+30-62:2+56x3=
(13+84)x9+30-62:2+56x3=
97x9+30-62:2+56x3=
873+30-31+56x3=
903-31+168=
872+168= 1.040
Explicație pas cu pas: