18,19,

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18,19,18,19, 18,19,18,50/3派.19,8派.20,32-8派

18,19,
18,19,

18,19,
18,50/3派.19,8派.20,32-8派

18 19 18 19 18,19 18 19 18,19, 18,19, 18 19 18,19, 18 19 18 19 18,.19, 《9+19/18》×《 -19》 (9+18/19)×(-19) 19又18/19等于? 17,18,19,20 数学题17-18-19 17 18 19 16 17 18 19