（x-1000)/-10%=-0.5
    0.131/x＝0.1289/0.86289
    0.4/100.58＝x/32.95
    （26.326+x）×2.45＝52.652+71.028-x
    x^2- 12.3x+ 24.5=0
    x^2-13.7x+41.4=0
    56Q－（580＋40Q）－（56Q×13％－5Q）×12％
    (75x^4)÷4-(165x^3)÷2+(593x^2)÷4-129x+45=9x^4+(141x^2)÷4-27x^3-22.5x+25÷4
    x2-x+2
    1.8-8x/1.2-1.3-3x/1.2=5x-0.4/0.3
    1.2/1.8-8x-0.2/1.3-3x=0.3/5x-0.4
    5x²-8x+4
    60000=45000*x^8
    4x+22.8=50.6
    3-4x=2.5
    2-(-x^2-3x-2)^2=0
    x²-6.3x+9.0＝0
    41=3.5x-8
    300000/（P-600-15）=500
    3.14/(x*sqrt(1-0.6^2))=0.75

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