2400/126-X/1000=0.00381（2400+X）
    √（x^2+4）-x
    （400-x）（8+0.08x）＝5000
    （400-x）（8+0.8x）＝5000
    (20+2x)(15-2x)+246=300
    x^4-5x^2+4=0
    x^2-√（x^2）-2=0
    x^2+x-2=0
    e^x+x=7
    ex+e-x
    8^X＝2
    350×（1+x）×（1十X）=504
    81-36b+4b^2=0
    81-36×b+4×b^2=0
    x^2-1280x+6400=0
    6=4/sin(x)
    4.7÷sin(35)=x÷sin(127.5)
    sin(x)=0.7932440077195318350430228581638353446878
    sin(x)＝0.7932440077195318350430228581638353446878
    x/x+1000

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