=) ( 1+2+3+...+100)+x=5350
=){(100+1).[ (100-1):1+1 ] }: 2+x=5350
=) 101.100:2+x=5350
=) 5050+x=5350
=) x=5350-5050=300
1 + 2 + 3 + 4 + 5 + ... + 100 + x = 5350
( 1 + 2 + 3 + 4 + 5 + ... + 100 ) + x = 5350
5050 + x = 5350
x = 5350 - 5050
x = 300
1 + 2 + 3 + 4 + 5 + ... + 100 + X = 5350
= ( 1 + 2 + 3 + 4 + 5 + ... + 100 ) + X = 5350
= [ ( 100 + 1 ) x 100 : 2 ] + X = 5350
= 5050 + X = 5350
X = 5350 - 5050
X = 300
Vậy nha Hoàng Đình Quang Huy
1 + 2 + 3 + 4 + 5 + ... + 100 + X = 5350
= ( 1 + 2 + 3 + 4 + 5 + ... + 100 ) + X = 5350
= [ ( 100 + 1 ) x 100 : 2 ] + X = 5350
= 5050 + X = 5350
X = 5350 - 5050
X = 300
k mình nha
1 + 2 + 3 + 4 + 5 + ... + 100 + X = 5350
= ( 1 + 2 + 3 + 4 + 5 + ... + 100 ) + X = 5350
= [ ( 100 + 1 ) x 100 : 2 ] + X = 5350
= 5050 + X = 5350
X = 5350 - 5050
X = 300
k mình nha
1+2+3+...+100+x=5350.
(1+2+3+...+100)+x=5350.
[(100+1)*100:2]+x=5350.
5050+x=5350.
x=5350-5050.
x=300.
Vậy.......
Tìm số tự nhiên x , biết :
1 + 2 + 3 + 4 + 5 + ... + 100 + x = 5350
( 1 + 2 + 3 + ... + 100 ) + x = 5350
[( 100 + 1 ) . 100 : 2 ] + x = 5350
5050 + x = 5350
x = 5350 - 5050
x = 300
1 + 2 + 3 + 4 + 5 + ... + 100 + x = 5350
( 1 + 2 + 3 + 4 + 5 + ... + 100 ) + x = 5350
[ ( 100 + 1 ) x 100 : 2 ) ] + x = 5350
5050 + x = 5350
x = 5350 - 5050
x = 300