7.83x=sin360x
    (X+5)/6=8/3
    (X+5)/6=3/8
    （27-5x）*（1+x）^10=27
    x2-2x-3=6
    （x+1）（x-3）=6
    （1+1/x）
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1319808.71
    9(x^4)-198(x^2)+1089
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1313548.71
    9(x^4)-30(x^2)+1393
    9(x^4)+165(x^2)+1165
    60%-40%*10%*（1+X）/X=40%
    60%-40%*10%*（1+X）/X=40%
    x*2.5=4
    -lnx＝x＾2*e＾x
    b^2＋5/9×b-5/81
     ((5.207237-x)*74.12-6.6306)/((0.2796+x)*18.02-0.128757) = 42.90972161
    4× X∧2+X
     ((5.207237-x)*74.12-6.6306)/((0.2796+x)*18.02-0.1288) = 42.90972161

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