Question

x + ( x - 1) + ( x - 2) + ...+ ( x - 50) = 255

 

Answer 1

x+(x-1)+(x-2)+...+(x-50)=255

x+(x+x+x+.....+x)-(1+2+3+...+50)=255

x+50x-1275=255

51x-1275

51x=1275+255

51x=1530

x=1530/51

x=30

Answer 2

trong phep chia cho 3 4 5 so du co the la bao nhieu

Answer 3

x + ( x - 1 ) + ( x - 2 ) + ... + ( x - 50 )

<=> x + x - 1 + x - 2 + ..... + x - 50 = 255

<=> 51x - 1275 = 255

<=> 51x = -1050

P/s: Sai thì bn sửa lại nha