sinn=0.07
    sina=0.07
    sina=0.07
    sina=0.07
    sina=0.07
    nπ/360-1/2sin（180-n）= π/4
    50一3x＝5
    119*n^2+144*n-64*n=0
    1-x/x+2
    X + X × 0.4 = 3600
    X + X × 0.5 = 3600
    35x+13x-9.6-x=
    nπ/360-1/2sin（180-n）= π/4
    nπ/360-sin（180-n）= π/4
    πx=3.14
    35x+13x=9.6-x
    （1+50%）yX80%-128=568
    （1+50%）xX80%-128=568
    4［n/360*3.14-1/2sin（180-n）］=3.14
    100x＝400

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