sinx-x
    X/0.6=8.4
    1.5X=10.5
    -10000000+x/1.0865+x*1.025/(1.0865)^2+x*(1.025^2)/(1.0865^3)+x*(1.025^3)/(1.0865^4)+(x*1.025^4+10800000)/(1.0865^5)=0
    s^2+8s+20=0
    (126+280)/28*x+224/28*(x+15)+84/28(x+30)=950
    72.1=（（0.021*x^1.85+666）^0.5）*x^0.84
    19.74=（（0.021*x^1.85+666）^0.5）*x^0.84
    x*(1+120%)=2.46
    205.5/28*x+280/28*(x+15)+56/28(x+30)=635
    x*10%+(1-x)*8%=9.4%
    (172+206)/28*x+241/28*(x+15)+112/28(x+30)=1867
    200=（20+5）x
    w^4 *（w^2+1）*（100w^2+1）=40000
    256w^4+68w^2+1=4
    1+1=x
    5^x=10x+5
    x×lnx
    3x^2-55x+36
    X∧X-42X-6

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