2x²-x
    0.6x+2/7-(2/7)x=0.336
    0.6x+2/7+(2/7)x=0.336
    10t+5t^2=6
    10t+5t^2=1.8
    （m-30）（600-10m）=10000
    -10x²+900x-28000=0
    4t+5t^2=1
    t*(20+5t)=8.8
    e^x=1
    x+1=0
    (118+201)/30*x+200/30*(x+15)+120/30(x+30)=892
    x*4+2x*3+6x-1=0
    -20x²+1970x-9950
    25=15t+1/2×（-2.5）t×t
    8^2+(16-5t)^2=10^2
    y^2-40y+144=0
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    7600/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)=150

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