=(0.2+0.8)+(0.4+0.6)+(1.2+1.8)+(1.4+1.6)+2.0+1.0 =1+1+3+3+2+1 =11
0.2+0.4+0.6+0.8+1.0+1.2+1.4+1.6+1.8+2.0=( )
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