Tìm x, biết: x(x+1)=2+4+6+8+...+2500
Giải thích
x. x + 1 = 2+4+6+8+10+...+2500
2+4+6+8+10+...+2500
2500−2:2+1=1250
2+4+6+8+10+...+2500
=2500+2.1250:2=1563750
x. x + 1 = 1563750=1250.1251
x=1250
x. x + 1 = 2+4+6+8+10+...+2500
2+4+6+8+10+...+2500
2500−2:2+1=1250
2+4+6+8+10+...+2500
=2500+2.1250:2=1563750
x. x + 1 = 1563750=1250.1251
x=1250