Question

Tìm x biết:

(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=675

Answer 1

( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + ( x + 5 ) = 675

x + 1 + x + 2 + x + 3 + x + 4 + x + 5 = 675

5x + ( 1 + 2 + 3 + 4 + 5 ) = 675

5x + 15 = 675

5x = 675 - 15

5x = 660

x = 660 : 5

x = 132

Answer 2

(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=675

x+1+x+2+x+3+x+4+x+5=675

5x+15=675

5x  =  675 :15

5x  = 45

  x  = 45 :5

  x  = 9

nhé!