1-C(40-10,5)/C(40,5)
    1-C(40-3,5)/C(40,5)
    1-C(40-9,5)/C(40,5)
    (1-C(40-(20-1),5)/C(40,5))
    (1-C(39-(20-1),4)/C(39,4))/(1-C(37,5)/C(40,5))
    (1-C(39-(12-1),4)/C(39,4))/(1-C(37,5)/C(40,5))
    (1-C(39-(12-1),4)/C(40,5))/(1-C(37,5)/C(40,5))
    (1-C(4,39-(12-1))/C(5,40))/(1-C(5,37)/C(5,40))
    12100+(1+109)^2
    12100(1+109)^2
    157.81×（9.02-3）-1/2×22.36×(2-0.27)×（(2-0.27)/3+9.02-2）- 1/2×28.38×(3.5-1.11)×（(3.5-1.11)/3+3.52）-5.33×3.52×3.52/2 - 1/2×(39.83-5.33）×3.52×3.52/3
    157.81×（9.02-3）-1/2×22.36×(2-0.27)×（(2-0.27)/3+9.02-2）- 1/2×28.38×(3.5-1.11)×（(3.5-1.11)/3+3.52）-5.33×3.52×3.52/2 - 1/2×(39.83-5.33）×3.52×3.52/3
    (0.2×10^(-6)×1^2×1.1^2×(2+0.6×0.697)×√40×157×195×200×1154^2)/101040.0654
    arccos(0.5√3)
    arccos(1.5√3)
    arccos(1.5√3
    arccos(√3/3)
    1.618^2
    2^ 22^200=x^300
    25+25-50cos150

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