口算
65+37×0= 28×0÷54= 4×28×25= 100×3÷100×3=
25×28= 50﹣25÷5= 2.7×0.03= 2.4÷0.06=
4.2÷3= 1×0.94= 1.2×0.8= 0.39÷1.3=
1﹣
= 
+
= 
﹣
= +
=
口算
65+37×0= 28×0÷54= 4×28×25= 100×3÷100×3=
25×28= 50﹣25÷5= 2.7×0.03= 2.4÷0.06=
4.2÷3= 1×0.94= 1.2×0.8= 0.39÷1.3=
1﹣= += ﹣= +=
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