12又3/4÷1又1/5+5.25*1/6
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12又3/4÷1又1/5+5.25*1/612又3/4÷1又1/5+5.25*1/612又3/4÷1又1/5+5.25*1/65.4/12 =5.4/6/2 =0.9/2 =0.45
12又3/4÷1又1/5+5.25*1/6
12又3/4÷1又1/5+5.25*1/6
12又3/4÷1又1/5+5.25*1/6
5.4/12 =5.4/6/2 =0.9/2 =0.45