( 2 × ( 7.3 + t ) + 0.8 × 11.5 ) × ( 8.7 * t + 156.48 ) / ( 18.8 + t ) ≥1.6 × 11.5 × 10
     ( 2 × ( 6.5+ t ) + 0.8 × 11.5 ) × ( 8.7 * t + 150.4 ) / ( 18+ t ) ≥1.6 × 11.5 × 10
     ( 2 × ( 4.4+ t ) + 0.8 × 11.5 ) × ( 8.7 * t +132.99) / ( 15.9+ t ) ≥1.6 × 11.5 × 10
     ( 2 × ( 7.2 + t ) + 0.8 × 11.5 ) × ( 8.7 * t + 155.47 ) / ( 18.7 + t ) ≥1.6 × 11.5 × 10
    2x∧2+5x+9＞0
    -3x<18
    (2×(7.2+t)+0.8×10.5)×(8.7t+155.47)/(18.7+t)≥1.6×10.5×10
    （2×（7.3+t）+0.8×10.5）×(8.7t+156.48)/(18.8+t)≥1.6×10.5×10
    （2×(6.5+t)+0.8×10.5）×(8.7t+150.4)/(18+t)≥1.6×10.5×10
    (2×(4.4+t)+0.8×10.5)×(8.7t+132.99)/(15.9+t)≥1.6×10.5×10
    (2×（18+t）+0.8×10.5)×(9.1+250.45)/(29.5+t)≥1.6×10.5×10
    （x - 2）（x - 10）＜ 0
    (2×(16.4+t)+0.8×10.5)×(9.1t+237.39)/(27.9+t)≥1.6×10×10.5
    （X-12）*350-250-50*（15-12）＞0
    （X-12）*350-250-50*（15-x）＞0
    1/2(sinx+xcosx)<0
    1/2(sinx+xcosx)>0
    1/2(cos-xsinx)>0
    （x-30-18）*40000-304000＞144000
    6ln(2+sinx)-3>0

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