arctg0.707
    (1234567890^12345678901234567890)%9999999999
    1.9*16+(16-16)*6.65+(44-16)*4.2
    19+6*6.65+(44-16)*4.2
    30.4+44*4.2 6.65*16+(44-16)*4.2
    (x+x*0.01)*2450=53900
    （2000x12x0.9-70%x120Xx7.1%）÷（30%x120X+5%x120X）= 3.8%
    64/0.6
    32+0.6*16*6 16*6
    32+0.6*16*5 16*5
    32+0.6*17*5 16*5+0.6*5*(17-16)
    32+0.6*17*5 16*x+0.6*5*(17-16)
    32+0.6*17*5
    1+x=5.6
    X-X/1.09*0.09-X/1.09*0.09*0.07-X/1.09*0.09*0.03-X/1.09*0.09*0.02=6283249.28
    X-X/109%*9%-X/109%*9%*7%-X/109%*9%*3%-X/109%*9%*2%=6283249.28
    x+1/x＝－1，x^2019+1/x^2019
    (x+1)-6(x+1)-4=0
    0.85*45X+0.15*15X=18500*0.53
    0.85*45X+0.15*20X=18500*0.53

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