（4.5+25）/((7000-1000)*0.95*0.9)
    （4.5+25）/((700-1000)*0.95*0.9)
    （4.5+25）/((7500-1000)*0.95)
    （4.5+25）/(7500-1000)*0.95
    370*13.1/8=
    sin（3π＋π/6）
    （2/5）^-4
    169/24
    328/42
    428/73 495/63
    152/22 293/43 302/44 457/52
    854/42 804/42 260/43 260/44
    (2+40/3)/11
    (4.75*8/19+(14+2/3)/1.1)/(11)
    46/3/11
    arctan 1
    68*32
    68√32
    √8051/50-1/50
    (50/200+10*10^(-6))/(3.14*10^(-4))*(1-exp(-(3.14*10^(-4)*1800)))

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