Question

Tìm x biết (x+1)+(x+2)+(x+3)+(x+4)+(x+5)=45

Answer 1

x+1 + x+2 + x+3 + x +4 + x+5 = 45

x + x + x + x + x = 45 -1 -2 -3 -4 -5

5x = 30

x =6