15.73-(2.17+0.73)这道题的简算,

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15.73-(2.17+0.73)这道题的简算,15.73-(2.17+0.73)这道题的简算,15.73-(2.17+0.73)这道题的简算, 

15.73-(2.17+0.73)这道题的简算,
15.73-(2.17+0.73)这道题的简算,

15.73-(2.17+0.73)这道题的简算,