-x^3+9x^2-19x+8
    199.64+(104.44+10.9x)(x+3)/2=(170.7x+38.21x*x)/2
    ln(0.2－x)＋ln(0.15－x)－2*ln(0.11－x)－0.28/(0.2－x)=0
    x2－4x＝21
    ?ⷽ??x+1=2
    ?ⷽ?̰???
    99.09*(1+x)^20=123
    ?ⷽ?
    4318+6145+34062.4x+335.244x+283.01x+216000=353280+357358+8456.4x+558720+182020+134691+（4318+6145+34062.4x+335.244+216000）*（0.25+0.05）
    b＾2+2.6b-3.6
    4318+6145+34062.4x+335.244+216000=353280+357358+8456.4x+558720+182020+134691+（4318+6145+34062.4x+335.244+216000）*（0.25+0.05）
    x＾2+2.6x-2.6
    -30x^2+80x+10=0
    2220.3-17.27x+(x-4.4)(x-4.4)(259.672+10.12x)/6=(x-4.4)(x-4.4)(661.8132+33.627x)/6
    2220.3-1727x+(x-4.4)(x-4.4)(259.672+10.12x)/6=(x-4.4)(x-4.4)(661.8132+33.627x)/6
    b×b+2.6×b－2.6=0
    1.6x^(2)-10.4x+7.28
    24.2^2+18*24.2-16.7^2-3*(420-s)=0
    v^2+18v-16.7^2-3*420=0
    800/（1.03+x)+800/(1.035+x)^2+10800/(1.041+x)^3 = 10278

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