sqrt(3)*cos（a）-sin(a)=sqrt(3)sin(a)cos(a)+sin(a)*sin(a)
    （e^x）-1
    3x+3/2xx=120
    （30-x）（500+2x）=10400
    x^4-4x^3+6x^2-4x+2=0
    x^3-x+1=0
    sin（x）=1.0000000000000000000000000000000000000000000000000000000000000001
    0.5^x=x
    x+16=4840/x+10
    x*x*x=485.8997173333333333
    4k²－8k－8
    30-0.5*2t(5-t)=26
    (5-t)(5-t)+4t*t=25
    （40-x)(2x+20)=1600
    2723*0.562*1.2*794/(794+x-36)=1006
    10x-x×x=0.8×x×x
    xx-(4+1)x+4-3=0
    xx-(-4+1)x-4-3=0
    (k+1)(k+1)-2(k-3)=23
    5x-x=1

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