x^4-(6+5)x^3+(7*6-4-6+7)x^2-(11*6-8-12+3)x+3*6=0
    x^4-(5+5)x^3+(7*5-4-6+7)x^2-(11*5-8-12+3)x+3*5=0
    1/3x-1/3=-x²-3x+4
    x^4-(8+5)x^3+(6*8-4+7)x^2-(9*8-8+3)x+3*8=0
    x^4-(7+5)x^3+(6*7-4+7)x^2-(9*7-8+3)x+3*7=0
    x^4-(6+5)x^3+(6*6-4+7)x^2-(9*6-8+3)x+3*6=0
    x^4-10x^3+(30-4+7)x^2-(45-8+3)x+15=0
    x^4-10x^3+(30-4+7)x^2-(9*5-8+3)x-15=0
    ln（1+lnx）/lnx
    6x^2-66x+108=0
    -5(x-20)^2+500
    (x-10)(-5x+150)
    875875x-875875sinx+3×300×3820x÷2÷π=1432500
    2x^2+3x+1=3
    150x+80(50-2x)/3 = 2010
    150x+80(50+x)/3 = 4020
    150x+80(50+x)/3=2010
    5x+30-85=3x+85
    857857x-857857sinx-573000x/π=1432500
    （2x-1）（x+1）=0

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