1-2
    -5-1
    7-3√5
    7+3√5
    7+3√5×7-3√5
    √2^4
    √2^5
    1-√2
    √2
    √2 ^2
    √3 ^2
    arcsin(1/13)
    4^(1/2)
    4^1/2
    1-2
    13^5÷6
    （600+450+700+600-（150+200））/2
    30+（9+15+2）*0.75
    0.04*75%*0.4468+6.5%*0.5532
    （600+450+700+600+150+200）/2

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