65*0.45+(x*0.55)=140 75*0.45+(x*0.55)=170 220*0.45+(x*0.55)=170
    255*x+75*(1-x)=170
    X=x/2+47
    X=x/2+4
    （X-2293.5）/X*100%=0.025
    (1-X)(1-X)(6-X)+36-18（1-x）-4(6-x)
    （55500*12-70%*15x*4.4%）/（30%*15x+3%*15x）=3.8%
    3/5（5/3（x－8）＋10）＝4x＋1
    x/2=-tan(x/2)
    (1-X)(1-X)(6-X)+36-18(1-X)-4X=0
    -XXX+8XX+X+24=0
    XX=2
    0.11x=1.23x
    （29+x）/(30+x)=0.97
    8xx+315x—950=0
    x=0.0033*（1-300x/2.613）^2
    8x(X+9)=112
    8×(x+9)=112
    3x*x+13x=0
    -2/3*x^2-4/3*x+2=x+1

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