-116.142x^5+367.215x^4-376.068x^3+134.001x^2-9.1214x+24.171=0
    3X-8×7．5％＝2．1
    2(x-2)=3(x-11*7) y-7=y-11*7
    -x^2+2x+3=0
    2(x-2)=3(x-11*7)
    xx+4x+1=0
    (1+x)^3*(1-x)^7=213/406
    2X一0．8X一7＝17
    x+2+7+2x=
    2x-3=59
    0.99*0.99*0.99*0.97*0.98
    x÷75％=80
    2x-3=56
    x^2-6x+8=0
    0.99*0.99*0.97
    x+2=2x+7 x=?
    0.98*0.98*0.85
    1+3x/2>2x-1
    x-3/2（2x-1）≤4
    X∧3+2X-4

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