(22.4+(60-22.4)/(50000-10000)*(28129.881-10000))*1.0*0.8 *0.95*0.7
    (π(48.34/2)^2-π(40/2)^2)*46*7.93/1000000
    (π(48.34/2)^2-π(40/2)^2)*46*7.93/1000
    (π(48.34/2)^2-π(40/2)^2)*138*7.93/1000
    √162÷2
    (π(48.35/2)^2-π(40/2)^2)*138*7.93/1000
    (π(48.4/2)^2-π(40/2)^2)*138*7.93/1000
    (π(48.5/2)^2-π(40/2)^2)*138*7.93/1000
    (π(48.3/2)^2-π(40/2)^2)*138*7.93/1000
    (π(48.3/2)^2-π(40/2)^2)*138*7.93
    (π(48.3/2)^2-π(40/2)^2)*138000*7.93
    94.6*0.8
    (88+(160-88)/(500000-100000)*(268129.881-100000))*1.0*0.8
    (π(48/2)^2-π(40/2)^2)*138000*7.93
    π(48/2)^2-π(40/2)^2
    π(48.3/2)^2-π(40/2)^2
    π(47.6/2)^2-π(40/2)^2
    (28.578×16×14.720+48×25.804)/(28.578×(16+19)+20)
    18*63
    π(48.3/2)^2-π(40.3/2)^2

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