Ex 1,2,3,4 va rog mult. Dau coroana

1. 46+5=51
2. 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
3. x+1=7 => x=7-1 => x=6 sau
x+1= -7 => x= -7-1 => x= -8 => x={-8,6}
4. sin C = AB/BC
sin C = 14/20 = 7/10