用适当的符号填空:a__{a} ; a__{a,b,c} ; d__{a,b,c}

用适当的符号填空:a__{a} ; a__{a,b,c} ; d__{a,b,c} 用适当的符号填空以下几个问题让我有点困惑,希望大家帮帮我!用适当的集合符号填空.a__{a,b,c}0__{x/x&su 选择填空：What's that?___ It's a__.a.bread b.milk c.carrot. 如果a+b+c=___{-a__[-b__(+c)]},那么等号右边的三条横线上所填符号应为 英语选择：This is a__ hat.选项：A.yellow big B.yellow small C.blue b what you smell?A__.It's not nice A lemon B cakes C fish The waiter usually works in a__.A public garder B shop C res 用适当的符号填空 -2.5（ ）Z {a}( ){a,b,c} Z( )Q a和b都是大于0的整数,当a__时,a分之b是真分数；当a__时,a分之b是假分数；当a__时,a分之b能化成整数 a和b都是大于0的整数,当a__时,a分之b是真分数；当a__时,a分之b是假分数；当a__时,这个分数大于2 设a>b,用不等号填空,-5a__-5b(不等式性质__),a+3/8__b+3/8(不等式性质__),9a__9b(不 2A+B=2C+3D中,25g的A和足量B反应生成34.2gC和10.8gD.若用9.8gB跟适量A完全反应,则需A__