cosx=tanx
    (1/2)h^2-h=0
    10x+8x-4x^2=(17*5*4)/80
    10x+8x=(17*5*4)/80
    150(1+x)^2=216
    2x+3=5
    (900(1+x)-360)(1+(8/9)x)=575
    (900(1+x)-360)(1+(8/9)x)=575
    (900(1+x)-360)(1+(8/9)x)=575
    196=w×w×0.1+2.152w+20
    k^2+4*k-14=0
    k^2+4k-14=0
    （10-x）(8-2x)=54
    196=w×w×0.1+2.152w+20
    194=0.1w×w+2.152w+20
    194=w×w+2.152w+20
    （10-x）(6-2x)=54
    194.9=0.1w×w+2.152w+20
    x²－0.3x－0.1
    195=0.1w×w+2.152w+20

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