X=68÷（4.4-1）
    68÷（4.4-1）=X
    1194.222x^4-6400x^2+6400=0
    7x－36+4x－45/0.5＝810
    tanx=0.2
    525cos20=527cosx
    2xx-15000=-sqrt2*x
    -1.1003=(1/x)*ln(1-x)
    -1.0898=(1/x)*ln(1-x)
    -1.0578=(1/x)*ln(1-x)
    7x+(2x+40)=760
    x（x/4+1）（x/36+1）=225
    -100X-20X=-24000
    20517003.44-(X/1.11*0.02)-75587.55-16879269.1=X
    (24000-X)/X*100%=20%
    240000-X/X=20%
    20517003.44-(X/1.11*0.02)-75587.55=X
    20517003.44-X/1.11*0.02-75587.55=X
    a-178665202.88-(a-150681321.92)*0.5/100-244049814.53*0.5/100=50000
    (240000-X)/X*100%=20%

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