口算．
0.3÷2= 0.42+6= 0.46+23= 1.4×0.5=
7.2÷0.12= 1.1×2.1= 3.9÷1.3= 0.68÷4=
0.36÷0.04= 0.49÷0.7= 3.6×2= 0.78÷0.3=
口算．
0.3÷2= 0.42+6= 0.46+23= 1.4×0.5=
7.2÷0.12= 1.1×2.1= 3.9÷1.3= 0.68÷4=
0.36÷0.04= 0.49÷0.7= 3.6×2= 0.78÷0.3=
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