7800000000*x＾2=49725*e（-1.5/x）
    -11.96=1.5÷x+2㏑x
    x∧2－17.8x＋79＝0
    X∧3-8x∧2+2x+3=0
    －9x²－6x－1＝0
    25x/x-3=（25x*6/5）/x
    2x-8=50
    30.4%=13.2%+x+13.2%x
    -2x^{7}+26x^{6}-130x^{5}+312x^{4}-366x^{3}+192x^{2}-38x+2=-x^{7}+13x^{6}-67x^{5}+174x^{4}-239x^{3}+166x^{2}-49x+3
    x^5-9x^4+28x^3-35x^2+15x-1
    x^9+((-2)-2-2*1-14)*x^8+(13*2+13*2+26*1+78)*x^7+((-66*2)-67*2-130*1-221)*x^6+(166*2+174*2+312*1+339)*x^5+((-218*2)-239*2-366*1-279)*x^4+(146*2+166*2+192*1+115)*x^3+((-45*2)-49*2-38*1-20)*x^2+(5*2+3*2+2*1+1)*x
    x^9+((-2)-2-2*2-14)*x^8+(13*2+13*2+26*2+78)*x^7+((-66*2)-67*2-130*2-221)*x^6+(166*2+174*2+312*2+339)*x^5+((-218*2)-239*2-366*2-279)*x^4+(146*2+166*2+192*2+115)*x^3+((-45*2)-49*2-38*2-20)*x^2+(5*2+3*2+2*2+1)*x
    x^2-10.3x+12.5=0
    x^2-14.9x+55.5=0
    5/3x+x
    3.4x-48=26.8
    x/(0.8*sqrt(1+0.64/4)*sqrt(1+0.64))=1
    1.5x/(1-x^2/2)=sqrt(3)
    90-arctanx/2-arctanx=60
    arctan(x)=60

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