lg(9)
    lg(11)
    ln(10)
    ln(10-1)
    ln(10+1)
    30×4= 19×50= 29×30= 23×50= 30×40= 19×500= 29×300= 23×500= 30×400=
    26.93*8.6+338.75*4.1-(38.05*(4.6+0.9)+220.12*(1.63+0.9)+(112*0.9+6.14*0.9*0.9)*(112*3+6.14*0.9)/(112*2+6.14*0.9)*0.9/3)
    23×20= 20×40= 31×200= 21×200= 23×200= 20×400= 19×5= 29×3= 23×5=
    17×50= 27×20= 40×600= 23×200= 17×500= 27×200= 20×4= 31×20= 21×20=
    23×20= 18×30= 30×300= 19×300= 23×200= 18×300= 40×6= 22×2= 17×5=
    (20*1.66-10*0.66)*3+2*20*1.732+10*0.66
    109400/(0.9×0.598×300)+60000/(0.8×0.76×300)
    17×400= 19×200= 17×200= 30×3= 19×3= 23×2= 18×3= 30×30= 19×30=
    20×2= 17×4= 19×2= 17×2= 20×20= 17×40= 19×20= 17×20= 20×200=
    122800/(0.9×0.598×300)+67500/(0.8×0.76×300)
    98200/(0.9×0.598×300)+74900/(0.8×0.76×300)
    (17.5*1.6+20+19.1*3.7+22*1.8+20*5.75-10*11.85)*0.333-2*20*0.577+10*11.85
    72800/(0.9×0.598×300)+132700/(0.8×0.76×300)
    26.96*8.6+419.13*4.1-(29.7*（4.01+0.4)+168.09*(1.42+0.4)+(101.73*0.4+6.14*0.4*0.4)*(101.73*3+6.14*0.4)/(101.73*2+6.14*0.4)*0.4/3)
    33×30= 22×40= 23×400= 19×200= 33×300= 22×400= 82×5= 15×2= 14×5=

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