tan(π/2)
    A(2,3)*A(3,4)
    (2,3)*(3,4)
    2^(3/2)
    log(sin4,4)
    e/tan0
    etan90
    log(A(4,7),C(4,7))
    A(4,7)C(4,7)
    205.53×21.13+435.25×16.13+2532.47×4.12+5.82×11.52-14.66×21.67-86.73×20.02-441.54×15.61-217.95×12.25-2418.69×5.05=
    138.00×11.43+6.44×11.43×11.43=
    (35.94×11.43+16.24×11.43×11.43)=
    205.53+435.25+(35.94×11.43+16.24×11.43×11.43)+5.82=
    4+2
    25*28 456/5 236/3 735/7
    58*79 39*28 46*72 37*68 88*66 97*23
    35.94+8.0×2.81×5.21+10×5.21=
    138.00+8.0×0.36×5.21+10×5.21=
    (1,9,9)
    0.2×19.7×2.81+2×7.4×1.68

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