6.12x^2-13.24x+6.12=0
    (arcsin x)×arccos x
    x^4-7x^3+2x^2-6x+2=0
    x^4-7x^3+2x^2-6x+2=0
    t*t+15t=150
    320/600*X=X-150
    （X-9）（X-2）＝0
    （X-25（X-2）＝0
    （X-2）（X-2）＝0
    （X-1）（X-2）＝0
    X²-6X+3＝0
    X²-7X+3＝0
    X²-3X+3＝0
    X²-3X+6＝0
    X²-3X+2＝0
    （3+x）/(4+x)=0.778 4+x=8
    0.06=[(x-99)/99]x(360/180)
    6%=[（x-99)÷99]*(360÷180)*100%
    6%=[（x-99)÷99]x360÷180x100%
    0.06=(x-99)÷99x2

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