简便运算;0.12+0.23+0.34+……+0.89=
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简便运算;0.12+0.23+0.34+……+0.89=简便运算;0.12+0.23+0.34+……+0.89=简便运算;0.12+0.23+0.34+……+0.89=解0.12+0.78+0.23+
简便运算;0.12+0.23+0.34+……+0.89=
简便运算;0.12+0.23+0.34+……+0.89=
简便运算;0.12+0.23+0.34+……+0.89=
解0.12+0.78+0.23+0.67+0.34+0.56+0.89+0.45=4.04