m（200-m）=9600
    200m-m 2
    X+X÷21.75÷8×2×8×4+X÷21.75÷8×2×3×21=5000
    X+X÷21.75÷8×8×4=5000
    81x+9=3.6
    6.38*1.04^x=10
    6.38*1.04^x=1.567
    1.04^x=1.567
    X/2+2
    X^20=170
    -20x²+820x+24400=0
    0.68299/3+1=(300/(x+300))/(300/(x+564.55))
    -20x²+800x+25620=0
    0.68299/3+1=(300/x)/(300/(x+564.55))
    7.2/411+1/30+(0.4*144)/2354=9457/x
    -x²
    x÷4×15=5/6
    x÷4/15=5/6
    4*t∧3-26*t∧2+50*t-21
    (2.78x)/(1400+x)＝0.667

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