x-1/4x-1/4x*1/5=30
    x-1/4x-1/4x*1/5=30
    5(p+3)×(-p-5+3/p)=1.2
    5p^3+40p^2+54p-45=0
    x^5-5x^4+2x^3-5x^2+3x-1=0
    cscx
    -x²＋17x＝70
    1=3.14^2*x^4/64+1/x^2
    4*x ^2/［（2+x）*（1-x）］=0.155
    4.4786=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    3.14^2*x^2+32/(x)^2=32
    sin(2*x)-sin(x) = 0
    sin(2*x)=0
    x（3—2x）=1600
    4×t^2-4×t+0.327=0
    x^2-16.9x+69.6=0
    -71810+60000+X-(20000-6800+X)*10%/4-6300=3000
    -71810+60000+X-(20000-6800+X)x10%/4-6300=3000
    -41800+30000-4500+X-X10%/4=3000
    -16300*X-X*2.5%=3000

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