口算：
5.7+6.3= 20.05+0.4= 34.6﹣4.9= 9﹣4.2=
5.5÷11= 8.2÷100= 5.783×1000= 2.5×4=
0.01×8= 12﹣1.2= 4.7×0×0.4= 125×1.7×0.8=
口算：
5.7+6.3= 20.05+0.4= 34.6﹣4.9= 9﹣4.2=
5.5÷11= 8.2÷100= 5.783×1000= 2.5×4=
0.01×8= 12﹣1.2= 4.7×0×0.4= 125×1.7×0.8=
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