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)
    336＝xx＋16x
    X*0.06+X=43000
    X*0.06+X=9000
    X*0.06+X=132000
    ｛（220+220）*78-x｝*0.85+8*78=45364-17012
    10000/（x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+1000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+7000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12）=250
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/（x+99*0.12）=250

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