150*10^0.5/7.5/7.5
    1430.244+1329.696
    1/7.5/10^0.5
    (1+sin55)/(1-sin55)
    90-arctan(0.2*7.5)-arctan(0.1*7.5)
    （4*11.71+20.96*8.24+793.59*3.41+31.4*0.22-92.28*10.64-2.75*0.019）/5.64
    1/4×1
    2/1×1
    （4*11.71+20.96*8.24+793.59*3.41+31.4*0.22-99.49*10.64-2.75*0.019）/5.64
    （4*7.97+20.96*4.5+330.28*1.66-61.81*0.61）/6.9
    221.616+744.094=
    (2021-1987.754922)*(1987.754922-2018)
    196.992 +106.704+235.198+205.2=
    7.5*4*6.840=
    6.9*5*6.840=
    7.8*2*6.840
    7.2*4*6.840
    689.472+640.224=
    7.2*13*6.840
    221.616+1208.628=

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