3乘1.5加2x等于11.5
    x^(2)＝10E(-4)×(0.1-x)
    x^(2)＝10∧(-4)×(0.1-x)
    （2x+3）（x-6）=16
    223.04+565.32+4.82+687.23+18.15t^2+307.34t=0.002+1002.21+746.64+6.6t^2+99.49t
    50.003x^2-66.796x+366.14=7.7774x^2-38.472x+369.98
    2865x^(2)-2343570x+280483200＝0
    4.8x+23.6x+0.00288x^2=84796
    42x^2-29x-4=0
    0.001152x^2+30.1345x-83451.59
    x/(3×(x^2+4)^0.5)=(7-x)/((7-x)^2+9)^0.5
    （2x＋3）(x-6）=16
    900+17009x^2-6.4x^6-127.5x^4=0
    70x=45×（x+5+5）
    49x^2-1900x+9900
    x^3+4*x^2-10=0
    6－3x＝15
    2x＋6＝18
    (x-4)^3+10-3*x=0
    (1+x)/(e^x)=0.95

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