x+1+x+2+x+3+...+x+100=5050
x+(1+2+3+...+100) =5050
x+5050 =5050
x =5050-5050
x =0
Vậy x= 0
x + 1 + x + 2 + x + 3 + x + .....+ 100
= x + 5050 = 5050
=> x = 5050 - 5050
x = 0
1) (-1005).(x cong 2 ) bang 0
2) x cong x cong x cong 91 bang -2
3) / 5x cong 1/ bang 11
( thong cam nha , may mik k viet dc dau cong vs bang )
mik dg gap , giup mik nhe !
A] X-1,25x4= 2,5 b] [ X CONG 1 ] CONG [ X CONG 2] CONG [ X CONG 3 CONG ] .............. CONG [ X CONG 20] = 750 C ] [ X CONG 1] CONG [X CONG 2 ] CONG [ X CONG 3 ] CONG ........... CONG [ X CONG 10] = 175
[ X 1 cong ] cong [ X 2 cong ] cong[ X3 cong] CONG .............. CONG 20 = 750
[ 2 CONG X ] CONG [ 4 CONG X ] CONG [ 6 CONG X ] CONG .......................... CONG [ 52 CONG X ] = 780
1 CONG 3 CONG 5 CONG .........CONG [ 2 x X CONG 1] = 169
3 mu x cong 2 cong 3 mu x bang 10
32 cong x cong 48 bang 101
1 CONG 2 CONG 3 CONG ........... CONG X = 210
1 CONG 3 CONG 5 CONG CONG .......... CONG [ 2x X CONG 1] =169
