5X+X=34-10
    13=0.549X^2+0.131X^3
    X×130％＝4175
    X×130％＝4175
    30000➗X×130％＝4175
    101.9=5÷（1+r)+110÷(1+r)²
    101.9=5÷（1+r)+110÷(1+r)²
    -2.15(r-1.5)²=1.628
    -2.15(r-1.5)^2=1.628
    90%X-80=70%X+40
    x ^ 5 + x ^ 4 + x ^ 3 + x ^ 2 + x +1=0
    sinx = 2
    x ^ 3=1
    x ^ 2 =1
    x/2+x+1=2001000
    x-x*0.065-(x+533000）*0.0003=533000
    0.1427=0.7541x-0.4447
    0.1427=0.1754x-0.4447
    8/x=x/4
    0.025*1.6667*y*0.4/1-0.025*1.6667*y*0.4=0.3

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