0.2加0.4,加省略号加0.8加0.10加0.12加省略号加0.98加0.100等于几?

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0.2加0.4,加省略号加0.8加0.10加0.12加省略号加0.98加0.100等于几?0.2加0.4,加省略号加0.8加0.10加0.12加省略号加0.98加0.100等于几?0.2加0.4,加省

0.2加0.4,加省略号加0.8加0.10加0.12加省略号加0.98加0.100等于几?
0.2加0.4,加省略号加0.8加0.10加0.12加省略号加0.98加0.100等于几?

0.2加0.4,加省略号加0.8加0.10加0.12加省略号加0.98加0.100等于几?
0.2+0.4+…+0.8+0.10+0.12+...+0.98+0.100
=2+0.6+1+1.4+1.8+2.2+2.6+3+3.4+3.8+0.1
=21.9