(x+1)+(x+2)+(x+3)+...+(x+100)=5750
x + 1 + x + 2 + x + 3 + .... + x + 100 = 5750
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 100) = 5750
100x + 5050 = 5750
100x = 5750 - 5050 = 700
x = 700 : 100 = 7
tk nha bạn
thank you bạn
(^_^)
sai rồi, thế này mới đúng:
(1+x) + (2+x) +(3+x)+... +(99+x) +(100+x)= 5550
x *100 + (1+2+3+4+...+99+100)=5550
x*100 + 100*101/2 = 5550
x*100 + 5050 = 5550
x*100 = 5550 - 5050
x*100 = 500
x = 500/100
x = 5
nhớ kich nha
(1+x) + (2+x) +(3+x)+... +(99+x) +(100+x)= 5550
x *100 + (1+2+3+4+...+99+100)=5550
x*100 + 100*101/2 = 5550
x*100 + 5050 = 5550
x*100 = 5550 - 5050
x*100 = 500
x = 500/100
x = 5
nhớ kich nha
(1+x) + (2+x) +(3+x)+... +(99+x) +(100+x)= 5550
x *100 + (1+2+3+4+...+99+100)=5550
x*100 + 100*101/2 = 5550
x*100 + 5050 = 5550
x*100 = 5550 - 5050
x*100 = 500
x = 500/100
x = 5
nhớ kich nha
(1+x) + (2+x) + (3+x) + .....+(99+x)+ (100 +x) = 5550
1+x+2+x+3+x+........+99+x+100+x = 5550
(x+x+x+..+x)+(1+2+3+4+..+100) = 5550
100x + 5050 = 5550
100x = 500
x = 5
