22.4*2200*72.5(1706.5-72.5)
    (2/15)*t^3+(1/10)*t^2=2
    0.4t^3+0.3t^2=6
    arctan0.5199
    arctg0.5199
    arctan0.4440
    arctg0.4440
    arc tg 0.4440
    0.7-cos111
    （x-3）（x-1/5）
    0.012*（0.54-a）=0.013*(a-0.59)
    (x-0.59÷0.012) = (0.54-x÷0.013)
    (1400*180*90+700*105*220+400*1800*900)/(1400*180+700*105+400*1800)
    (k-390)^4/(k^2+20k) =0.7^4
    (x-390)^4
    x^2+16=(4√5-x)^2
    x^2+16+90+x^2-8√5x
    (1800*180*90+700*120*7/8*220+400*1800*900)/(1800*180+700*120*7/8+400*1800)
    130/35
    15.3*752.16^0.3333

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