-2x²+100x-1200=0
    -2x²+100x-400=0
    x/(x+49)=0.1
    t^2-（-（（1/2）t））^2=4t-4
    12*x^2-18*x-39=0
    24531×24531a+11475×11475×(16944-a)=252333225×16944+16944a(16944-a)
    24531×24531a+11475×11475(16944-a)=256803264×16944+16944a(16944-a)
    4x²+2[x(100-2x)]+2[x(50-2x)]=1400
    8x∧2+（8300-8x）*8x=5300∧2
    8x∧2+（8300-8x）*8x=5300*5300
    8x∧2=8
    8x∧2
    x∧2
    x
    22050*300+50*y=(300+y)*12000
    22050*300+50*y=300+y*12000
    X/1.01=100+(X/1.01*1%*12%）+(X/1.01+100)*0.0003+(X/1.01-100-((X/1.01+100)*0.0003)-(X/1.01*1%*12%))*5%
    x÷(190-x)=0.618
    x²-16x-64=0
    r²-16-64=0

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