90/x+90/（x+13.2）＝1
    tg arccos0.79－tg arccos0.9
    tg arccos0.79－tg arccos0.9
    (x-90.22)/x=11%
    2y+3=21
    3x+1=-x-2
    x-11＝（1.5x-22）5.5/√x
    0.01118x=(0.95－x)(1－x)^1.5
    500*（p-0.45）-1250=4000-250p
    （P+ 0.45）*500-1250=4000-250*P
    500P+225-1250=4000-250P
    (2000+50sin(x))*tan(2x)＝50
    (59*5+1250)*（1+x）^-5=1000
    596+x-30=625
    (x-31.83)/x=45%
    (x-56)/x=5%
    (x-50.79)/x=5%
    (x-31.83)/x=45%
    (x-55.83)/x=5%
    (x-31.16)/x=45%

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