X=450÷（1+（1/4）-（1/2）-（3/7））
    y（500-y）=62500
    5=16*X/(X+2000)
    10=16*X/(X+2000)
    1.44=16*X/(X+2000)
    1.44=4.2*2.78*X/(X+1400)
    1.44=4.2*278*X/(X+1400)
    1.44=6.672*X/(X+1400)
    1=6.672*X/(X+1400)
    100=6.672*X/(X+1400)
    √3（1-x）²=√27
    17.53%×（1385.245kg-2.208）=
    0.130/x＝0.1289/0.86289
    0.4/100.58＝x/32.7
    x/lnx
    (1-2k)/k²=2/k²-3
    1.8x+2.4=x
    340000000=14.3*750*x*(660-x/2)
    60(1-x)*80(1+2x)=(1600*16-7120)/15+36*80(1+2x)
    7x^2+100x-5300=0

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