(10+x)(280-10x)=3450
    x＾(1/3)
    lnx+1/x
    sin(x)=(x-1)^3-4x+3
    (1-x)(1-x)=0.0064x×x
    8x^3-4x-1＝0
    8x3-4x-1＝0
    260÷3×x^2＝702000
    x+1/1-x
    x²-20077922x-62431925379
    a＝arctana
    35x-x*x=300
    -3x*x/16+9x/8+3=0
    2a*a-6a+4=0
    (800-y)(1200+0.2y)=854000
    （800-y）(1200+0.2y)=854000
    （800-y）(1200+5y)=854000
    1245.632=195*(1-r^11)/(1-r)-195
    371.7945e^(−0.231x)−228.69e^(−0.1386x)=0
    371.7945e−0.231x−228.69e−0.1386x=0

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