（（X-300）*0.75）/3300=（（x-300-360）*0.75）/3000
    （X-300）*0.75/3300=（x-300-360）*0.75/3000
    （X-300）*0.75/3300=（（X-300）*0.75-75）/3150
    （x-300-360）*0.75/3000=（（X-300）*0.75-75）/3150
    x*99.975%-132.000*100.025%=1/10
    x*99.975%-132.041*100.025%=1/10
    3y-8=2y+5
    1.8X=5.6
    7x-8.4=2
    m^2-2*m+10=0
    x^4-4*x^3-100*x^2+1600=0
    13.11c=（3.3+c）×7.92
    13.11c=（3+c）×7.92
    （50+x）/（25+x）=1.7
    4.74×n^20+6×n^19=29.293
    5.88×n^20+6×n^19=31.8912
    x^6-6x^5-15x^4-20x^3-15x^2-6x-1=0
    XX+2X-20=0
    (20+2X)(40-X)=1500
    (20+2X)(40-X)=1200

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