(lg2)^2+lg2*lg50+lg25
    tan 629.90904127
    tan 629.9090413
    tan 629.9090414
    tan 629.909041
    tan 89.358839165
    tan 89.35883916
    tan 89.358839
    sin86
    -1^2.718
    1÷lg3
    12乘4
    105×¾
    1/(1+0.1)^10*(1+0.1)
    1145141919809+1
    1+1/2/2+2/2+3
    lg2+lg5
    123456/6546313
    13135435+5464531
    1400×[1+(5-1．5)％×3／12]

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