1.03^30+1.03^29+1.03^28+1.03^27
    1369863*729927
    41841*2151
    2439*369
    tan45
    142857*7
    142857*8
    142857*10
    arctan-1+arctan-1
    15*14*13*12*11*10*9*8*7*6*5*4*3*2*1
    1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18*19*20
    arctan1+arctan1
    1/2/3/4/5/6/7
    14593*14593
    251*251=
    (4/7)×(5/9)+(5/7)×(3/9)
     1 - (1 - 0.30)^5
    1-0.2^5
    1 - (1 - 0.30)^5
    180×sqrt(9÷1.67×1.67+1)÷3÷sqrt(99.4×99.4×9+1)÷sqrt(1.25)÷sqrt(0.0084×0.0084×9+1)

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