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Răspuns :

a=44
b=68
c=21

2a-b+3c
Adica->2×44-68+3×21=483

a=81-9*6+3*7-38

a=81-54+21-38

a=27+21-38

a=48-38

a=10

b=2*(24-6*3)+6*6-40

b=2*(24-18)+36-40

b=2*6+36-40

b=12+36-40

b=48-40

b=8

c=(15+7*8)-6*4-42

c=(15+56)-24-42

c=71-24-42

c=47-42

c=5

2a-b+3c=2*10-8+3*5=

=20-8+15=

=12+15=

=27