Question

cum se rezolva: 1+2+3+...+500+x=3000 dau coroana plz

Answer 1

1+2+3+...+500+x=3000 
1+2+3+...+500=3000-x
500*501/2=3000-x
125250=3000-x
x=3000-125250
x=-122250

Answer 2

1+2+3+...+500+x=3000
500×501:2 + X = 3000
250×501 + X = 3000
125250 + X = 3000
X = 3000-125250
X = - 122250