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40×6÷2-20=
(17+17×14)÷17=
5×a+4×b-3c+33=


Răspuns :

40×6÷2-20=
=240:2-20=
=120-20=100


(17+17×14)÷17=
=17(1+14) :17=1+17=18

5×a+4×b-3c+33=
5a+4b+-3c+33