Ta có: 2+4+6+8+...+2x=210
\(\Leftrightarrow x^2+x-210=0\)
\(\Leftrightarrow x^2+15x-14x-210=0\)
hay x=14
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2+4+6+8...+2x = 210
2+4+6+8+.....+2x=210
2+4+6+8+...+2x=210
2+4+6+8+.........+2x=210
2+4+6+8+.........+2x=210
2+4+6+8+...+2x=210
2+4+6+8+............+2x=210
2+4+6+8+...+2x=210
2+4+6+8+...........+2x=210