(12+21*45*10.2)/(15*4*0.7*51)=12/(15*4*0.7*51)+(21*45*10.2)/(15*4*0.7*51)=(3/15)*(4/4)*(1/0.7*51)+(21/0.7*2)*(45/115)*(10.2/51*2)=1/(5*0.7*51)+15*3*0.1=2/357+4.5=4又361/714
[12+21*45*10.2]除以[15*4*0.7*51]
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