x/1.13*0.1+x=21
    17x^2-16x+2＝0
    1253.514+193=193*(1-r^11)/(1-r)
    19.2*(1-r^11)/(1-r)=19.2+114.7
    24:x=（1-20）：x
    2x=1
    20x-2x²
    X=40/1.25
    3x²-5x-2=0
    0.014x^2-0.019x+0.639=100
    7√2x²-30x=180
    √2x²-30x/7=180/7
    0.001x^2+0.001x+0.032=10
    x^4+8*x^3+4*x^2-1=0
    2*x^3+9/4*x^2+7/16*x-3/64=0
    0.0009x=1
    1.0009^x=2
    x^0.9=2
    x^0.0009=2
    x^0.09=1.1

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