（（a*34.51*365+a*34.51*365/12*1*0.015）*95%*99%-(a*34.51*365+a*34.51*365/12*1*0.015）*95%*99%*21.9%+（a*34.51*365+a*34.51*365/12*1*0.015）*95%*99%*3%+（2850*34.51*2%)+(2850*34.51*0.2%)）*21.5=472097
    （（a*34.51*365+（a*34.51*365/12*1*0.015）*95%*99%）-(a*34.51*365+（a*34.51*365/12*1*0.015）*95%*99%)*21.9%+（a*34.51*365+（a*34.51*365/12*1*0.015）*95%*99%)*3%+（2850*34.51*2%)+(2850*34.51*0.2%)）*21.5=472097
    （（a*34.51*365+a*34.51*365/12*1*0.015*95%*99%）-(a*34.51*365+a*34.51*365/12*1*0.015*95%*99%)*21.9%+（a*34.51*365+a*34.51*365/12*1*0.015*95%*99%)*3%+（2850*34.51*2%)+(2850*34.51*0.2%)）*（1.028^38-1）/（6%-2.8%）=621180
    （（a*34.51*365+a*34.51*365/12*1*0.015*95%*99%）-(a*34.51*365+a*34.51*365/12*1*0.015*95%*99%)*21.9%+（a*34.51*365+a*34.51*365/12*1*0.015*95%*99%)*3%+（2850*34.51*2%)+(2850*34.51*0.2%)）/（6%-2.8%）*（1.028^38-1）=621180
    （（a*34.51*365+（a*34.51*365/12*1*0.015）*95%*99%）-(a*34.51*365+（a*34.51*365/12*1*0.015）*95%*99%)*21.9%+（a*34.51*365+（a*34.51*365/12*1*0.015）*95%*99%)*3%+（2850*34.51*2%)+(2850*34.51*0.2%)）/（6%-2.8%）*（1.028^38-1）=621180
    （15+1.5）/（1+x）-14=0
    x=86000+10%×x+（x×6.72%）
    1744.31+123X*4=4091.36*123
    x^2-1.33x+0.412=0
    x=0.05x+0.0672x+86000
    π*(420^2-74^2)=X*4*0.042
    x=0.1x+0.0672x+86000
    π*(D^2-74^2)=2000000*4*0.042
    200/135+800/141-X/1000=0.005（1060+X）
    200/135+800/141-X/1000=1060+X
    lnx²
    x^2+2x+2
    x^2+2x+2
    1000-1500x=400
    0.75-（x/125）^0.714*0.75＝0.39

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