sin（3.14*0.53）
    sin（3.14*0.36）
    4301.172*(0.8/0.9)^1/5+785*(0.8/0.9)^1/4
    4301.172*（0.8）^1/5+785*(0.8)^1/4
    32^2
    1/2×1.7×18
    (30600/1.11+36900/1.11^2+43700/1.11^3)-84000
    (10500/1.11+17400/1.11^2+15600/1.11^3)-29800
    C(32,2)
     (10500/1.11+17400/1.11^2+15600/1.11^3)/29800
    (30600/1.11+36900/1.11^2+43700/1.11^3)/84000
    ((63.25/3.15+71.94/3.35+83.43/3.6+88.27/3.85)/4)*3.85*1.07
    (63.25/3.15+71.94/3.35+83.43/3.6+88.27/3.85)/4
    (（19.8*2.7+20*1+22*1.6+24*3.4）×64.2+25×-56.6)/(20.79×15+20)
    (（19.8*2.9+20*2.1+22*0.9+24*3.8）×64.2+16×-56.6)/(20.68×16+20)
    （19.8*2.9+20*2.1+22*0.9+24*3.8）/9
    (18.0×1.6+19.2*2.4+19.8*5.2+20*2.1+22*0.9+24*3.8)/16
    (（19.8*2.7+20*1+22*1.6+24*3.4）×64.2+25×-56.6)/(20.79×15)
    (（19.8*1.79+20*1.3+22*4.41）×18.40+20×-2.72)/(20.34×16+20)=
    [(5116120/(1.22×47.32×10^3 ) )^2+(26856/(10.92×10^2 ) )^2 ]

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