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afla 18:(a x 3-6)x 7=21


Răspuns :

18:(ax3-6)x7=21

18:(ax3-6)=3

ax3-6=54

ax3=60

a=60:3

a=30

18:(3a-6) ori 7 = 21 (imparti la 7)

18:(3a-6) = 3

3a-6 = 18/3

3a-6 = 6 (aduni 6)

3a = 12 (imparti la 3)

a = 4