x^2+x
    (1+1/x)^x
    (0.341+0.249×10^(-3) ×(900+t)/2)×(900-t)/0.23=792
    (0.341+0.249×10^-3 ×(900+t)/2)×(900-t)/0.23=792
    (0.341+0.249×10-3 ×(900+t)/2)×(900-t)/0.23=792
    (0.341+0.249×10-3 ×(1000+t2)/2)×(1000-t2)/0.23=792
    364.32=0.341+0.000249*（900+x）*（900-x）
    78x-x^2＝158
    4X+2（2X-3）=50
    2X+2（2X-3）=50
    2X+2（2X-1）=22
    3X+2（2X-1）=22
    4X+2（2X-1）=22
    4X+6X-24=156
    4X+2（3X-12）=156
    1×p×25%=1×p×（1-5%）-285
    (x-113.318)*10-1-1=2
    x*tanx=1.536
    0.35=0.056x÷(1+(x-1)×0.056)
    0.35=0.056x/1+(x-1)×0.056

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