6x²+3x-6.3=36405596.7
    2^2+2^3+...+2^n
    x-√4-x^2
    1250x^2+100x-1＝0
    10^－1.1＝x^2/10^-2－x
    0.8x+0.2x=x
    0.8x+0.2x=x
    0.8x+0.2x=x
    0.8x+x=x
    0.8x+x=x
    0.8x+x=1x
    0.8x+x=x
    0.8x+x=x
    0.8x+x=x
    0.8x+x=x
    ln(10/x)=83.5467
    2*1.38*(25+273.15)/1.6/10000*㏑（10/x）=11
    0.0399x²-5=70-2x
    100+0.8(y-50)+100+60+80-20-0.05y
    100+0.8(y-50)+100+60+80-20-0.05y

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