(140.5+340)/30*x+116/30*(x+15)+120/31(x+30)=1209
    20-a=2÷3×a
    x^2+2023x-2024=0
    x2+2023x-2042=0
    900/20x+2=900/15x
    7800/x+10000/（x+22）+10000/x=150
    7600/x+20000/（x+22）=150
    7600/x+10000/（x+22）+10000/x=150
    s^3＋10s²＋25s＋10＝0
    x/1.09+（94-x）/1.13=84
    x/1.09+（94-x）/1.13=84
    sin2x+cos2x
    tanx-x=π/9
    tanx-x=π/9
    tanx-x=π/9
    （5.98+21.32X）*（29.32+21.32X）÷（21.32-21.32X）÷（25.79-21.32X）=13.2
    (1+x)^29+(1+x)^28+(1+x)^27+(1+x)^26+(1+x)^25+(1+x)^24=12.4153
    (1+x)^29+(1+x)^28+(1+x)^27+(1+x)^26+(1+x)^25+(1+x)^24=12.4153
    3x^2+4x-10
    40x十（105-x）X30=3640

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