4sin(2x)=3.4
    log(10,x)=0.8
    x^3-12x-16=0
    90-arctanw-arctan(0.5×w)=55
    48x^2+42x+8=0
    5X^5+5X^4+5X^3+5X^2+5X=10
    17x/28*8+x/27=2184/31
    90-arctanx-arctan0.5x = 55
    5X^2=10
    ^
    x/5=5
    3.2/7=(x+8)/5
    （5500*12*0.9-0.7*145X*0.064）/（0.3*145X+0.05*145X）=0.038
    3.6sin(4x)=0.9
    1-0.4-（（1+a)/a)*0.1*0.5=0
    x*2=6
    k^2-4*1*(1/2k+2)>=0
    x^4.5=0.81578947368
    x+2=5
    90-arctanw-arctan0.5w=55

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