10x-x^2-23.04=0
    xtanx=2.56
    xtanx=2.5588
    y∧2+5.372793y-0.0133881579
    (5500+4*w^2)*(-5000+5*w^2)+25000000=0
    (5500+4*w^2)(-5000+5*w^2)+25000000=0
    3/（10x）+1/（4x）=44
    （5500+4*w^2）*(5000+5*w^2)+25000000=0
    3/10x+1/4x=44
    （5500-4*w^2）*(5000-5*w^2)-25000000=0
    （5500+4*w^2）*(5000+5*w^2)-25000000=0
    6x^2-16=0.5x^4+8
    16x=x^4-4x^2+16
    8*10^9*x^2+6012000x-84=0
    x*ln(X/0.426)=0.02768702
    x*ln(x/0.107)=0.0259
    X*ln（X/0.17）=0.02326741
    183.36+（7P-436.56-(7P*0.13-14-112)*0.1)*0.75=260
    （x+3）（x+1.5）＝4.5
    x∧2+3.75x-2.25＝0

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