请展开查看知识点列表
×15= ÷3= 2÷ = 1+2%= + =
× = ÷ = ×75%= 7.5÷2.5= - =
16× = 4.8÷ = 10÷10%= × =
× = 21÷ = 0.42+58%= 40×15%=
以A为观测点
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