7.7x+3.3x=12.2
    s^2-s+2＝0
    3(x+2)-2(x-3)=16
    135.29/(1+X/12*6)+0.39/(1+X)=128
    6.3x-2.5x=3x+0.8
    5.46×(4.8+t)^2*（2+2/3*t）-18.68*t^2*(3.6+2/3*t)=0
    9.87*s^4-16*s^2+4=0
    0.01x-100000-0.006×(x-5000000)=10000
    3.14*3.14*s^4-16*s^2+4=0
    3.14*3.14*s^4+16*s^2+4=0
    117.026= X/495*100
    92.843= X/495*100
    78.788= X/495*100
    83.865= X/495*100
    105.602= X/495*100
    103.067=X/495*100
    -0.15(x-4)(x-4)+3=0
    16a+3=0.6
    0.15（x-4）(x-4)+3=0
    abs(abs（x-3）-x)=4

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