7.5*x*600*1000000+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*0.5*x*600*1000000+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*80*600+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*x*600+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*x*600+210000*166/x*(x-55)*1077=210000*166/x*(90-x)*1500+210000*166/x*(350-x)*1500
    7.5*0.5*x*600+210000*166/x*(x-55)*1077=210000*166/x*(90-x)*1500+210000*166/x*(350-x)*1500
    1.2x乘以5%=
    x^2-11/2*x+5/2=0
    x²-10x-112=0
    393-22x=85
    393-22x=85
    x+x*0.01=400
    x:120=36:48
    x^23+456=41255
    (X-700)-700*0.037/12*2-(X+700)*3/10000-(X-700)*0.13*0.12=0
    2/5x+1/3（100-x）=36
    1/3（170-x）-1/4x=10
    1/2:1/4=1/6:x
    32=（（0.021*x^1.85+557）^0.5）*x^0.84
    171=（（0.021*x^1.85+557）^0.5）*x^0.84

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