9-（4-x)=2
    9-（4-x)=2
    t²-14t+14=0
    900*9.8h+50000+75/359*2*20*900*2.04*2.04=101300
    900*9.8h+50000+75/359*(2-h)*20*900*2.04*2.04=101300
    x^2-200×x×cos12.47+4375=0
    x^2-200xcos12.47+4375=0
    tan(x)=14/13
    24975+10.5x=0
    arccosx=0.663
    arccosx=0.663
    arccosx=0.663
    40÷（（1÷（1/3））+（1÷（1/2）））÷（1/2）=x
    x=40÷5*2
    x+11/1=110+x
    x^2-200cos9×x+4375=0
    x^2-2×100×75×cos9×x+4375=0
    x^2-14815.5x+4375=0
    x^2-14815.5x+4375=0
    x^2-14815.5+4375=0

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