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calculeaza:100:10+42:7+81:9=
450-8*8*5*8=
200-9*6=
100-7*7=
387+2*9=


Răspuns :

100:10+42:7+81:9=
=10+6+9
=16+9
=25

450-8×8×5×8=
=450-64×5×8
=450-320×8
=450-2560
= -2110

200-9×6=
=200-54
=146

100-7×7
=100-49
=51

387+2×9
=387+18
=405