Mathematics
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    90*3.1415926
    90*pi
    73.883×1.5-70.113
    20%*(100*10000+900000) = A*10000-A*10000*5%-1900000
    6x+3x=600
    x^2+6x-75=0
    arctan(3.46)
    arctan(3.85)
    40000*(1+x)^-1+40000*(1+x)^-2+40000*(1+x)^-3+40000*(1+x)^-4+540000*(1+x)^-5=560000
    1.05^4
    (800000-50000)+800000*[(1+5%)^4-1]+800000*4.5%
    (800000-50000)+800000*[(1+5%)4-1]+800000*4.5%
    250=3.14÷4×(x×x)×1.8x+0.26(x×x×x)
    12^2+6.4^2
    0.727x+56.23/1.25-0.272x+52.3/1000 = x
    -250000*0.9091+100000*0.8264+200000*0.7513
    -250000*0.9091+100000*0.8264+220000*0.7513
    -250000*0.909+100000*0.826+220000*0.751
    x+x*0.095+(x+0.095*x)*0.068=211542.5
    3x-4.5x(1/6-x)

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