\(\left(x+1\right)+\left(x+2\right)+....+\left(x+50\right)+100=1475\)
\(\left(x+1\right)+\left(x+2\right)+...+\left(x+50\right)=1475-100=1375\)
\(\left(x+x+...+x\right)+\left(1+2+..+50\right)=1375\)
\(\frac{\left(50+1\right)\times50}{2}+50x=1375\)
\(1275+50x=1375\)
\(50x=1375-1275=100\)
\(x=100\div50\)
\(\Rightarrow x=2\)
= x+1+x+2+...+x+50+100=1475
=) x+1+x+2+...+x+50=1475-100=1375
=) (x+x+x+...+x)+(1+2+...+50)=1375
50 số x
=) 50x+(50+1).[(50-1):1+1]:2 = 1475
=) 50x+51.50:2=1475
=) 50x+1275=1475
=) 50x=1475-1275=200
=) x=200:50=4
( X +1 ) + ( X + 2 ) + .......... + ( X + 50 ) + 100 = 1475
=> 50x+(1+2+3+...+50)+100=1475
=> 50x+(1+2+3+...+50)=1375
=> 50x+\(\frac{\left(50+1\right)50}{2}\)=1375
=> 50x=100
=> x=2
Phùng Quang Thịnh bạn làm sai rồi :)
Mình viết nhầm : là 1375 ko phải 1475 do mình làm nhanh
<br class="Apple-interchange-newline"><div id="inner-editor"></div>(x+1)+(x+2)+...+(x+50)=1475−100=1375
(x+x+...+x)+(1+2+..+50)=1375
(50+1)×502 +50x=1375
1275+50x=1375
50x=1375−1275=100
x=100÷50
x = 2
(x+1)+(x+2)....(x+50)+100=1475
(x+1)+(x+2)......(x+50)=1475-100=1375
(x+x+x+x+......+x) +(1+2+3+...+50)
Có số chữ x là
(50-1):1+1=50 (chữ)
Tổng các số từ 1 đến 50 là:
(50+1)*50:2=1275
Ta có:x*50+1275=1475
X*50=1475-1275
X*50=200
X=200:50=4
( x + 1 ) + ( x + 2 ) + ... + ( x + 50 ) + 100 = 1475
( x + 1 ) + ( x + 2 ) + ... + ( x + 50 ) = 1475 - 100
( x + 1 ) + ( x + 2 ) + ... + ( x + 50 ) = 1375
x . 50 + ( 1 + 2 + ... + 50 ) = 1375
x . 50 + 1275 = 1375
x . 50 = 1375 - 1275
x . 50 = 100
x = 100 : 50
x = 2
