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    15×a×0.5=4.9
    xtan0.5x=2.594
    X²-6X-10=0
    X²-6X-10=0
    x^2-2x=2/3
    x²-2x=2/3
    a=√(40*40+20*20)
    a*a=40*40+20*20
    (6-x)(2+x)=15
    (6-x)(2+x)=14.8
    124.4+48+(22-x)*4.3=(50+89.2+6.5x)/1.5
    124.4+(22-x)*4.3=(50+89.2+6.5x)/1.5
    1/4x-x=6
    x+24%*x
    16=24+x+24*x
    16=24+x+24*x
    16%=24%+x+24%*x
    (2500-x*100)*x=39000
    (2500-X*100)*x=39000
    X^6-7X^5+8X^4+33X^3-30X^2-63X-27=0

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