Question

Tìm x

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

 

Answer 1

5x+15=45

5x=35

x=7

Answer 2

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

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

5x + 15 = 45

5x = 45 - 15

5x = 30

x = 30 : 5

x = 6

Answer 3

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

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

5x + 15 = 45

5x =45 - 15

5x = 30

x=30:6

x=5