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Calculate 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20
2+4+6+8+10+12+14+16+18+20，=（2+18）+（4+16）+（6+14）+（8+12）+20+10，=20+20+20+20+20+10，=20×5+10，=100+10，=110．
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