90-arctan(sqrt(2))
    (100000,1) （200000，2）（300000，3）
    0.1536/0.4384
    0.48*0.32
    0.4+0.48*0.08
    -0.021736+0.010868+0.492
    0.096*(-0.226415)
    0.212*0.226415*0.226415
    -96/424
    cos138.2
    (82^2-4*128.6718576257230^2*(sin(3.1415926536/11.586417))^2)^(1/2)
    3.14*1.5
    292500000000^(1/2)=
    250000^2+200000^2+300000^2-0.4*250000*200000+1.2*250000*300000+0.5*200000*300000=
    (250000^2+200000^2+300000^2-0.4*250000*200000+1.2*250000*300000+0.5*200000*300000)^1/2=
    7/16*15+7/16
    -3/8*2.5^2
    sqrt(56.25)
    50000000*0.7-50000000*0.7*0.1+50000000*0.7*0.1*0.1=
    e18

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