5^10－(2×5^9+5^8.5+5^4.6+20×5^1)
    5^10－2×5^9+5^8.5+5^4.6+20×5^1
    5^10－2(2×5^9+5^8.5+5^4.6+20×5^1)
    2(2×5^9+5^8.5+5^4.6+20×5^1)
    2×5^9+5^8.5+5^4.6+20×5^1
    （-2.5）^3
    sin75
    1766164.127617*0.003
    1766164.127617*1.003+1750
    C(700,2)*45
    C(700,2)
    0.000023*250*10^9
    4*65*10^-6/(5*2.3)
     arctan(1/2)
    atan(1/2)
    atan(1/2)
    cos22
    056-067-(466+45)
    056-067
    5^（3/5）

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