(19.8*2.7+20*1+22*1.6+24*3.4)/8.6
    (18.0×0.7+19.4*3.4+19.2*0.8+19.8*4.1+20*1+22*1.6+24*3.4)/15
    120.6*4
    2*(8*6+8*3+6*3)-8*6
    2*(50*25+2.5*25+2.5*50)
    (（19.4*1.79+19.2*2.9+19.8*3.4+20*1.3+22*4.41）×18.40+20×-2.72)/(20.34×16+20)
    2*(50*100+2.5*100+2.5*50)
    2*500/sqrt(3)*ln(0.05/0.05)-350+350*0.05^2/(0.1^2-0.05^2)*(0.1^2/0.05^2-1)
    867*1.5
    2*500/sqrt(3)*ln(0.05/0.05)-310+310*0.05^2/(0.1^2-0.05^2)*(0.1^2/0.05^2-1)
    6*3*3
    2*500/sqrt(3)*ln(0.05/0.05)-310+310*0.05^2/(0.1^2-0.05^2)*(0.1^2/0.5^2-1)
    4[361.7+24.37×(22.5-3.45)^2 ]
    2*(13*10+13*12+12*10)
    (18.40-1)×1/(tan30)
    tan(45+30/2)^2×e^(πtan30)
    (（19.8*1.3+20*2.5+22*1.8+24*1.2）×111.79+15×56.6)/(18.90×14.3+20)
    (（19.8*1.3+20*2.5+22*1.8+24*1.2）×111.79+15×（-56.6）)/(18.90×14.3+20)
    (（19.8*1.3+20*2.5+22*1.8+24*1.2）×111.79+15×-56.6)/(18.90×14.3+20)
    6*12*12

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