=>(x+x+x+...+x)+(2+4+6+...+100)=2700
=>50x+(100-2):2+1=2700
50x+50=2700
=>50x+(100+2)x50:2=2700
50x+2550=2700
50x=2700-2550
50x=150
x=150:50
x=3
mk chịu,nói đáp án cho mk nha!
chán ghê,nhớ cách làm thì mk ko nhớ nổi,bực quá!
(x+2) + (x+4)+(x+6)+...+(x+100)=2700
=>50x+(2+4+6+...+100)=2700
=>50x +2550=2700
=>50x =150
=>x=3
=>50x+(2+4+6+..+100)=2700
=> 50x+2550 =2700
=>50x=2700-2550
=>50x=150
=> x=150:50
=>x=3
(x+2) + (x+4) + (x+6) +...+ (x+100) = 2700
x + 2 + x + 4 + x + 6 +...+ x + 100 = 2700
(x+x+...+x) + (2+4+6+...+100) = 2700
50x + 2550 = 2700
50x = 2700 - 2550
50x = 150
x = 150 : 50
x = 3
=>(x+x+x+...+x)+(2+4+6+...+100)=2700
=>50x+(100-2):2+1=2700
50x+50=2700
=>50x+(100+2)x50:2=2700
50x+2550=2700
50x=2700-2550
50x=150
x=150:50
x=3