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Happy summer vacation, wonderful every day, grade five, mathematics, 22 pages of answers, People's Education Edition.
All numbers must be non-repetitive even numbers with nine * * *; (2+ 18)*2/2=90

2+4+6++ 18 = 90 points, three lines have 90/3 = 30; It means that every three numbers add up to 30.

Easy to draw; 2+ 12+ 16=30 is the first line. 4+8+ 18=30 is the second line. 6+ 14+ 10=30 is the third line.