4.9t^2+6.25t-25=0
    2x^2-60x+600=0
    －2x²＋80x＋19200＝20000
    sinx*ln（1+x*x）
    (1+5.98%)*10328/(r-2/7*6.8%*35%-5.98%)=415403
    (1 + 5.98%) * 10328/(x-5.98%)= 415403
    (1 + 5.98%) * 10328/(W-5.98%)= 415403
    (1 + g) * 10328/(9.15%-g)= 415403
    (1 + g) * 10328/(9%-g)= 377639
    (1 + g) * 10328/(8.32%-g)= 377639
    x=2，sin3x/1-cosx
    -1/9（x-6）²+4=2.5
    1/8 x²+15x-250=0
    1.03*10^（-7）*36*36=x(0.0042+2x)(0.0042+2x)
    1+x*2
    x^2+(3x-8)^2=10
    （92+x）÷158=0.618
    20(30+t)/60=40t/80
    (0.75x+1)^2+(0.75x-3)^2=10
    66÷（92+x）=0.618

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