50=a×50%+(500-a)×5%
    n+40=1.5n
    1/√x
    0.6*（1+g）/12+g=11%
    z^8=81
    0.63=0.9^x
    11x+64-2x＝100-9x
    (12/x)-12/(4+x)=4
    12/x-12/4+x=4
    64k^4+4k^2+32k^3+3k=0
    （16k²+1）k²+（8k²+3）k=0
    tany－y＝4.637
    tany－y＝4.637
    tany－y＝4.637
    tany－y＝4.637
    tany－y＝4.637
    tanX－X＝4.637
    tanx－x＝4.637
    tanx－x＝4.637
    tanx－x＝0.5

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