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    243x²+12x-348
    (1+x)^30+(1+x)^29+(1+x)^28=6.575
    (1+x)^7+(1+x)^6+(1+x)^5=3.341
    (1+x)^20+(1+x)^19+(1+x)^18=4.893
    (1+x)^10+(1+x)^9+(1+x)^8=3.645
    (1+x)^4+(1+x)^3+(1+x)^2=3.065
    arctan(22.41*w)-90-arctan(0.2*w)-arctan(0.5*w)-arctan(422.86*w)=-180
    √(100×((22.41*w)^2+1)÷w^2÷(0.04*w^2+1)÷(0.25*w^2+1)÷((422.86*w)^2+1))=1
    √(100÷0.51^2÷(0.04*0.51^2+1)÷(0.25*0.51^2+1))=1÷a
    -90-arctan(0.2*w)-arctan(0.5*w)=-110
    ex-x-2=0
    x*2487=(10-x)*334.4
    lg√(100÷0.78^2÷(0.04*0.78^2+1)÷(0.25*0.78^2+1))=-1*lga
    20*lg√(100÷0.78^2÷(0.04*0.78^2+1)÷(0.25*0.78^2+1))=-1*lga
    20*lg√(100÷0.78^2÷(0.04*0.78^2+1)÷(0.25*0.78^2+1))=-lga
    √(100÷w^2÷(0.04*w^2+1)÷(0.25*w^2+1))=1
    √(100÷0.78^2÷(0.04*0.78^2+1)÷(0.25*0.78^2+1))=1/a
    0.5+0.5*8*x+0.5*16*x*x=1
    √(10^2÷0.78^2÷((0.04)*0.78^2+1)÷((0.25)*0.78^2+1))=1/a
    0.2+0.2*8*x+0.2*16*x*x=1

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