1.12X+(0.066*1.07X)=100000
    200X+（110*0.65-X）*130+65*110+110*0.25*75=22696
    8x^(2)+10x-7=0
    200X+（130*0.65-X）*130+65*87+87*0.25*75=22696
    15x+100(1-x)=40
    3x＋1<2(x＋2)
    m^(2)-5m-93.75=0
    －2x<4
    2x-1≥3(x-2)
    (1.2×43.84×10^3)/(2×(3.14d^2)/4)=195
    1.5=2x^2*(1/0/011)*(2x^2/4/x)^(2/3)*(0.00085)^0.5
    (1.55/2)*((1+8(x/9)^2/(9.81*1.55^3))^0.5-1)=3.08
    x-5+7=45
    4x+3x(100-x)=370
    10n^9-9n^10-0.75=0
    x
    20x+10*（30-x）=420
    2.4y=20
    2.4y=19
    2.4y=18

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