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a) 26-12:2+15x4-13+18:9-44
b) 9+7x3-42:6-54:9-68:4
c) (15-10:2):5+(15+7x3):(14+4)
d) (5x3-6x2)x(2x4+3)-(9-7)x(8:2-2+9)
e) (5+14x2-54:9):3+3x(26:9+2)-42:2


Răspuns :

a) 26-12:2+15x4-13+18:9-44=
26-6+60-13+2-44=25
b) 9+7x3-42:6-54:9-68:4= 
9+21-7-6-17=0
c) 
(15-10:2):5+(15+7x3):(14+4)=
10:5+36:18=
5+2=7
d) 
(5x3-6x2)x(2x4+3)-(9-7)x(8:2-2+9)=
(15-12)x(8+3)-(9-7)x(4-3+9)=
3x11-2x10=
33-20=13