1.6x×300+1.3x×100+0.7x×100=15000
    (b+3)²=(3/5√10)²+(5/6√10-sqrt(9+b²)²
    (b+3)²=(0.6√10)²+(5/6√10-sqrt(9+b²)
    n^2/4（1.5-2n）^2=0.012
    x^3+5×x+252=0
    x*sinx+cosx
    ex+e-x＝1/x
    500（1+y)=7200
    x＾lnx
    4x+(200-x)*2＝754
    4x+(200-x)*2＝700
    d*d+2d+2=2*(d+1)*(d+2)*(d+3)
    0.4*(x*0.97*(5+2*x)/(5+x*2*5^0.5))^2=1
    x*0.97*(5+2*x)/(5+x*2*5^0.5)=1
    x*0.97*(5+2*x)/(5+x*2*5^0.5)=2
    x*0.97*(5+2*x)/(5+x*2*5^0.5)=1
    x*0.97*(5+2*x)/(5+x*2*5^0.5)=0.55
    x*0.97*(5+2*x)/(5+x*2*5^0.5)=1
    0.97*(5+2*x)*x/(5+x*2*5^0.5)=1
    0.97*(5+2*x)/(5+x*2*5^0.5)=0.55

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