1/1200=0.00007x+0.00112
    15(sin(x))+20(sin(90-x))=25
    -0.5x²+1.5x=1
    -0.5x²+1.5x=0
    -0.5x²+1.5x+2=0
    6X^2+3X=36405603
    6X^2+3X-6.3=36405596.7
    6X^2+3X-6.3=36405596.7
    6X^2+3X-6.3=36405596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    600=x*（500-200）-4800
    41/6x-4=0
    1.5k-4=25/4
    （25/22）x+(50/11)=0
    n(n-1)=55*2

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