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ex. h) repede dau coroana

Ex H Repede Dau Coroana class=

Răspuns :

2×(3×X+2)+5=45 X=[(45-5):2-2]:3= X=(40:2-2):3= X=(20-2):3= X=18:3= X=6 Verificare=2×(3×6-2)+5=45