(80-2t)(60-t)=300
    10000x3+x-0.2=0
    ((sin2x)/6.28+(3.14-x)/3.14)^0.5=0.5
    ((sin2x)/6.28+(3.14-x)/3.14)^0.5=0.8
    -0.12%=(1.0228-X)÷1.0228
    （n-2）×180=135×n
    15x^2-54x+39=0
    15x^-54x+39=0
    15x^2-22x+39=0
    0.75*x+105*0.25=200 0.75*x+121*0.25=220 0.75*x+255*0.25=225
    40/(x*sqrt(1+0.04*x^2)*sqrt(1+0.0625^2*x^2))=1
    sin2x-2x+2.2608=0
    255*x+120*(1-x)=220
    40/(x*sqrt((1+0.04*x^2)*(1+0.0625^2*x^2)))=1
    (800-20t)（600-10t）=30000
    40/(x*sqrt(1+0.04*x^2)*sqrt(1+0.0625^2*x^2))
    90-arctan3.8=x
    40/(x*sqrt(1+0.04x^2)*sqrt(1+0.00390625x^2))
    x=10000(1.15)^5
    10000(1+0.15)^5=x

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