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39.8-(19.8+11.5)=39.8-19.8
72×12=×1072×
3400÷25÷4=3400÷(×)
5.9+3.1= 3-1.8= 2.7÷3= 3.5×3=
+ = 3- = × = 5÷ =
进入组卷