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{12:[9-(2×a+2)]}×4=100:10+(10-4)
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Răspuns :

Răspuns:

{12:[9-(2×a+2)]}×4=100:10+(10-4)

{12:[9-(2×a+2)]}×4=10+6=16

{12:[9-(2×a+2)]}=16:4

12:[9-(2×a+2)]=4

[9-(2×a+2)]=12:4

9-(2×a+2)=3

(2×a+2)=9-3

2×a+2=6

2×a=6-2

2×a=4

a=4:2

a=2