Question

9+10+11+.........+18=b
Rezolvarea vă rog dau coroană

Answer 1

Răspuns:

Explicație pas cu pas:

9+10+11+...+18

9+10+11+12+13+14+15+16+17+18

20+10+12+13+14+15+16+17+18

30+12+13+13+15+16+17+18

30+30+13+14+15+16+17

60+13+14+15+16+17

60+30+14+15+16

90+14+15+16

90+30+15

120+15

135

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