（ln0.08）/pi
    4=√2h÷√9.8
    4=√2h÷9.8
    4×x^4+120×x^3+98769×x^2-2697930×x+18510525=0
    x^3+5×x+1=0
    300x=1800÷x+2
    x÷(x+591.02)=0.15
    x-arctanx=0
    15（x+16）-3571=16X+13
    (π*X²+1.5)%2
    29203.54+x*0.08=x/7
    x^3+2x^2+6x-8
    1.1x-1.2/1.2=x-1/1-10%
    7^7-50x7^5+6x7^4+4x7^3+25x7^2-30x7-16
    7^7-50x7^5+6x7^4+4x7^3+25x7^2-30x7-16
    X／70＝X／60一1
    X／70＝X／60一1
    X／70＝X／60一1
    (2x+1)/(x+2)=3/2
    （20-y）*（500+50y）=10800

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