x^2-10x+4=0
    x^2+5x+6=0
    （40-x）（2x＋20）＝1050
    (3+x)/(4+x)=0.95
    1+x=√3x
    (120-75-x)(400+3x)=13350
    (120-x)(400+3x)=13350
    3x²+40x-34650
    5720x*（195-0.4x）=120*1000000
    11.44x*（195-0.4x）=120*1000000
    11.44x*（195-0.4x）=120
    400*64.3-400t=150*165.3-150t
    400/165.3*t = 150/64.3*t
    400/165.3*t=150/64.3*t
    3^x=9^x
    x+tan(0.8x)=0
    -πx/(1-x^2)^0.5=ln0.25
    6*x^4+2*x^2-1＝0
    xe＾（1/x）
    300*12*a=70000+40*12a

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