90*（3-x）=45*(5-x)
    lg(3/4)=x
    -0.08=lgx
    lg1=x
    lg2=x
    3x^2-48x+144
    x*lnx＝1.203*10^44
    x^3-2*x-5=0
    x+(x*0.03)=85000
    3/4x²+9/4 x-3=0
    x=20÷1.08+21.5÷1.08^2+23÷1.08^3+24.5÷1.08^4+(1+5%)^4x×0.94÷1.08^4
    x=20÷1.08+21.5÷1.08^2+23÷1.08^3+24.5÷1.08^4+1.2x×0.94÷1.08^4
    x=20÷1.08+21.5÷1.08^2+23÷1.08^3+24.5÷1.08^4+1.02x0.94÷1.08^4
    sin（3x-π）
    x=27.1102863202545+2.68012290562036+2.77050805800636+1+8*1200/1038+(x/1.05*5%)*1.12+x/1.05*12%
    x=124.48+10.02+5.78+6.72+1+(x/1.09*0.09)*1.12+x/1.09*12%+8*1200/1038
    x=88873.277385672+4488.10050797644+8682.60814410931+(x/1.03*3%)*1.12+x/1.03*0.1%
    x=88873.277385672+4488.10050797644+8682.60814410931+1+(x/1.03*3%)*1.12
    x=124.48+10.02+5.78+6.72+1+(x/1.09*0.09)*1.12+x/1.09*12%+8*942.36/4609.5
    x=27.1102863202545+2.68012290562036+2.77050805800636+1+8*1200/1038+(x/1.05*5%)*1.12+x/1.05*12%

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