Bài làm
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + ( x + 5 ) = 45
x + 1 + x + 2 + x + 3 + x + 4 + x + 5 = 45
5x + ( 1 + 2 + 3 + 4 + 5 ) = 45
5x + 15 = 45
5x = 30
x = 30 : 5
x = 6
Vậy x = 6
# Học tốt #
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+\left(x+4\right)+\left(x+5\right)=45\)
\(\Rightarrow x+1+x+2+x+3+x+4+x+5=45\)
\(\Rightarrow\left(x+x+x+x+x\right)+\left(1+2+3+4+5\right)=45\)
\(\Rightarrow5x+15=45\Rightarrow5x=30\Leftrightarrow x=6\)
(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=45
5x+(1+2+3+4+5)=45
5x+15=45
5x=45-15
5x=30
x=30:5
x=6
Vậy x=6
Chúc bạn học tốt
Ta có :
(x+1) + (x+2) + (x+3) + (x+4) + (x+5) = 45
=> x.5 + (1 + 2 + 3 + 4 + 5) = 45
=> x.5 + 15 = 45
=> x.5 = 45 - 15
=> x.5 = 30
=> x = 30 : 5 = 6