200*x^2+(5+2*sqrt(10))*x-22.6＝0
    6(2x-1)-3(4x-1)=4(3x-2)-1
    x+1/2（43-x）=30
    4x-8(x-15)=180-6x
    400+200x+200(x+1)^2=1400
    9000-2x^2-190x=8448
    arcsinx+arccosx
    arcsinx+arccosx
    arcsinx+arccosx
    27t-5t²＝9.6
    27t-5t²＝9.6
    (3-x)^2+9x^2=9
    11/15-x+3/5=1/2
    x+1/xx+1
    255.7×7.94+12.08x=（255.7+x）×7.97
    255.7×7.93+12.08x=（255.7+x）×7.97
    1100/v+10000/(v+22.4)=64.96
    5100/v+10000/(v+22.4)=85.042736
    5100/v+10000/(v+22.4)=85.04
    5100/v+10000/(v+22.4)=85.04

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