10x-x*x=48
    1+x+x*x=91
    2x^2-6x+1=0
    1+x+x*x=91
    2x^2-6x+1=0
    54x²-81x+4=0
    10000=849.52/(1+x)^(1/12)+849.52/(1+x)^(2/12)+849.52/(1+x)^(3/12)+849.52/(1+x)^(4/12)+849.52/(1+x)^(5/12)+849.52/(1+x)^(6/12)+849.52/(1+x)^(7/12)+849.52/(1+x)^(8/12)+849.52/(1+x)^(9/12)+849.52/(1+x)^(10/12)+849.52/(1+x)^(11/12)+849.52/(1+x)^(12/12)
    10000=431.8/(1+x)^(1/12)+431.8/(1+x)^(2/12)+431.8/(1+x)^(3/12)+431.8/(1+x)^(4/12)+431.8/(1+x)^(5/12)+431.8/(1+x)^(6/12)+431.8/(1+x)^(7/12)+431.8/(1+x)^(8/12)+431.8/(1+x)^(9/12)+431.8/(1+x)^(10/12)+431.8/(1+x)^(11/12)+431.8/(1+x)^(12/12)
    22x+30（1/2x+15）=6000
    10x-x²=-4
    cosx-sinx=2sinxtanx
    8x+16（100-x）=1264
    15一（8一5x）=8一4x
    （x-2）一（4x一1）=11
    （X一2）十X一1=3
    28x+44*(0.3-x)=12
    X(X+1)=6.25
    X(X+1)=6.25
    X(X+1)=6.25
    X(X+1)=6.25

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