口算:
2.5×0.7×0.8= (2.5+0.9)×0.4= 42÷0.6= 5.6×1.01=
3.9+1.01= 0.42= 4.8t﹣0.2t﹣2t= (5.5﹣5.5)÷3.3=
1.52= 3.3﹣0.7﹣0.3=
口算:
2.5×0.7×0.8= (2.5+0.9)×0.4= 42÷0.6= 5.6×1.01=
3.9+1.01= 0.42= 4.8t﹣0.2t﹣2t= (5.5﹣5.5)÷3.3=
1.52= 3.3﹣0.7﹣0.3=