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
    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
    （18500×12.387+8.44X）÷（18500+X）=10
    x^2-140x+675=0
    6x+x=350
    x^2/(1-x)(4-x)=2.6
    x^2/(1-x)(4-x)
    -2*0
    -2^2
    6.6*10^-11*70*52/1.5^2

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