4-3（100-88）^2/1600
    tan(60.5)
    tan(61)
    tan(62)
    tan(60)
    tan(65)
    0.65*4.6
    3/5*1/7*6/13+5/7*1/5*3/13+1/13*13/7*2/5
    0.55*4.6
    16.7/(4.6)^0.5+218
    16.7/(4.6*10)^0.5+218
    16.7/(4.6*100)^0.5+218
    16.7/(4.6*1000)^0.5+218
    16.7/4.6*100+218
    16.7/4.6*10+218
    16.7/4.6+218
    16.7/4.6*1000+218
    16.7/1.6*1000+218
    （12/17+1212/1717+121212/171717）÷（121212）
    0.69*1/4.7^0.5

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