x ^2+12x-253=0
    4x ^2+8x-7=0
    8x ^2+2x-7=0
    8x ^2x-7=0
    6x-15=-4x
    3x^2+5x-1=0
    8*（x-19）=3x
    2x+18=8x-6
    x*0.07+x=50000
    x*0.07+x
    3^2-3^2
     5x = 0
    5x=0
    x^2-5x-14=0
    8x^2+7x-1=0
     -3s^3-8s^2-6.5s-2 = 0
    tan(9π/16)
    958+656.9*0.24+1040.7*0.6+1090.5*0.16
    1459.21-299.011*2.5+44.968*16+3.264*2.5*16+9.338*2.5*2.5+0.522*16*16
    1459.21-299.011*2.5+44.968*0.16+3.264*2.5*0.16+9.338*2.5*2.5+0.522*0.16*0.16

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