3x/（1-x）（2-x）=3.8
    2x/（1-x）（2-x）=3.8
    2x/（1-x）^2=3.8
    x^2/（1-x）^2=1.9
    2X^3+21X^2+60X+40=0
    0.9a^2-482a=0.3
    7.5-(x*x+2.25)^0.5+0.000000315=(36+x*x)^0.5
    cosx+0.3cos2x+0.4sinx=0.5cosx
    cosx+0.3cos2x+0.4sinx-0.5cosx=0
    54×㏑（T/293）+0.02×（T-293）=0
    1-x²-x=0
    1-x²-x=0
    （-3）∧x
    x^2+16*x-64*64=0
    3.77（0.09-x）(0. 16-x)=x
    1050=6/（1+r）+ 6/（1+r）^2 + 106/（1+r）^3
    60*1138+y*65=140300
    60*1132+y*65=140300
    60*1131+y*65=140300
    60*1211+y*65=140300

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