(-a^2+8a+20）(2a-24) = 2a(8a+44-a^2)
    3.3/(75+x)x=0.825
    3.3/(75+25)*25=
    3.3/(75+x)x=1.25
    √36665809/100
    0.13x+x = 13532
    3.44-0.086*x-0.064*x+0.064*x*x-0.03*x*x*x+0.06*x*x-0.03*x=3.3538
    3.44-0.086*x-0.064*x+0.064*x^2-0.03*x^3+0.06*x^2-0.03*x
    100+100=
    0.034049/(1+190338^2)
    0.6*2.5499^2-7.8*2.5499+24+19.2*sin(15*2.5499)-6.24*2.5499*sin(15*2.5499)-14.4cos(15*2.5499)+2.88*2.5499*cos(15*2.5499)
    0.6*2.5499^2-7.8*2.5499+24+19.2+sin(15*2.5499)-6.24*2.5499*sin(15*2.5499)-14.4cos(15*2.5499)+2.88*2.5499*cos(15*2.5499)
    2+3+4
    f×（sin60+sin30）=20
    6y+150=7y-200
    arcsec（-2）
    arcsec-2
    （x-100）×（1300-5x）
    40+0.4x+0.4x+0.004*x^x=48.4
    40+0.4x+0.4x+0.004x^x=48.4

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