简算：11.11+13.13+15.15+17.17+19.19=？

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11.11+13.13+15.15+17.17+19.19
=(11+13+15+17+19)*1.01
=75*1.01
=75.75

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11+13+15+17+19+0.11+0.13+0.15+0.17+0.19
=15*5+0.15*5
=75+0.75=75.75

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两边加都是30.3 即30.3*2。5=75.75

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