口算.0.9+0.4= 9-0.7= 0.36+0.54= 1-0.26= 3.6+0.4= 1.29-O.29= 0.74+0.26= 0.57-0.5= 2.8+1.12= 6.2+
口算.0.9+0.4=9-0.7=0.36+0.54=1-0.26=3.6+0.4=1.29-O.29=0.74+0.26=0.57-0.5=2.8+1.12=6.2+1...
口算.0.9+0.4= 9-0.7= 0.36+0.54= 1-0.26= 3.6+0.4= 1.29-O.29= 0.74+0.26= 0.57-0.5= 2.8+1.12= 6.2+1.8= 2.8-2.3= 1.3-0.6=
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