x^2-12x+45=0
    x-12x+45=0
    x（12-x）=45
    （30-3x）（24-2x）=480
    -10lg（1-x）=3.6
    X-17.5%=3
    （18-3x）（6-2x）=60
    x²-9x-2=0
    x^2-50x+225=0
    640-52x+x²=540
    （20+2x）（32+x）=570
    780x^2 -60000-640000=0
    t²+（21-t）²=15
    （78652+100X）÷（789+X）＝99.73483
    （78652+100X）÷（789+X）＝99.73452
    （78652+100X）÷（78652+X）＝99.73
    （78652+100X）÷（78652+X）＝99.73483
    x^2-140x+4800=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.96061)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.6015786)

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