How to calculate 9.8 plus 0.2 minus 9.8 plus 0.2?
9.8+0.2-9.8+0.2=9.8-9.8+0.2+0.2=0+0.2+0.2=0.4
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- 20. Calculation 0.1 + 0.2 + 0.3 + ····· + 9.8 + 9.9 + 10 + 9.9 + 9.8 + 9.7 + ······· + 0.2 + 0.1