6.9÷0.9×1.8÷2.3
    6.9÷0.9*1.8÷2.3
    （0.48*1.25）÷（7.1－5.9）
    3.8*2.3+27*0.38
    (1+1.00%)^5/(1+5%)×3%/(1+6.5%)^5
    (1+1.00%)^5/(1+6.5%)^5
    (1+1%)^5/(1+5%)×3%/(1+6.5)^5
    (1+1%)^5/(1+5%)×3%/(1+6.5)^5
    (1+1%)^5/(1+6.5)^5
    0.108*18.4*（1.146*3.64）^1.7
    【tan（arccos0.84)-tan（arccos0.93）】
    (tanarccos0.75-tanarccos0.91)
    (tanarccos0.75-tanarccos0.93)
    (tanarccos0.82-tanarccos0.95)
    0.108*18.4*（1.146*3.64）^1.7
    1440.61*[1-1/(1+8.0%)^64.43]
    sin30
    0.108*18.4*（1.146*3.64）^1.7
    120/（0.634/0.025-0.5）
    (tanarccos0.71-tanarccos0.90)

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