√((140×70)/3)
    1.18×(140+70)/4
    75.941/3493.45*100
    (1.5×(12-1)×10)/(2×(18.6-10) )-((12-1))/2
    (1.5×(12-1)×10)/2*(18.6-10) -((12-1))/2
    (1.5×(12-1)×10)/2(18.6-10) -((12-1))/2
    (2×(12-1)×10)/(2(18.6-10))-((12-1))/2
    (17×(2.1-1)+18.5×3+18.6×2.5+19.1×(12-2.1-3-2.5))/11
    (17×(2.1-1)+18.5×3+18.6×2.5+19.1×(12-2.1-3-2.5))/12
    (1276.73+2770.47+322.23)+(764.235+20.224+1104.361+260.968+115.26+77.92)+0.5[(1971.53+972.972)+(1972.07+2226.27)+2125.765]
    (777.91+3055.44+447.39)+(764.235+20.224+1104.361+260.968+115.26+77.92)+[（972.972+126.126）×0.5+15.597]+[(2226.27+165.13)×0.5+133.24]+574.175×0.5=
    arccos0.618034
    arcsin0.618034
    1.82×（54.6×2+20.7×2-4.2）×0.5
    √(1+20^2)/(20*√((1+20^2/4)*((1-20^2/9)^2+20^2/9)))
    √(1+20^2)/(1*√((1+20^2/4)*((1-20^2/9)^2+20^2/9)))
    √(1+10^2)/(10*√((1+10^2/4)*((1-10^2/9)^2+10^2/9)))
    √(1+10^2)/(10*√((1+10^2/4)*((1-10^2/9)^2+18^2/9)))
    √(1+5^2)/(5*√((1+5^2/4)*((1-5^2/9)^2+5^2/9)))
    √(1+3^2)/(3*√((1+3^2/4)*((1-3^2/9)^2+3^2/9)))

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