0.5×1125.96×9.8
    0.5×1221.63×9.8
    (1125.96×9.8)/(4911.5+4×125)
    (1221.63×9.8)/(5411.5+4×125)
    3.14/4×400^2×4911.5
    3.14/4×400^2×5411.5
    3.14/4×400^2×5411.5
    (57.16+32.3+294.91+16+5.34)×0.2
    (57.16+32.3+324.93+16+5.34)×0.2
    53×5454-54×5353
    π/4 (412^2-400^2 )×4911.5×7850
    π/4 ×(412^2-400^2 )×5411.5×7850
    π/4 (412^2-400^2 )×4911.5×7850
    (2^2+3^2)(4^2+5^2)(6^2+7^2)
    （1+2）（2+3）（3+4）
    (900×12×12×12)/12
    (900×12×12)/6
    2.5*（0.8/0.9）^0.5
     77×21+45－12＋111×4523655
    77*21

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