（40÷X+8.5）÷（50÷X+6.8）=0.507÷0.493
    k^2-2k-4=0
    x+8*sqrt2=sqrt2*x
    51635.208*2=(2/x)-(2/x*2)(1-e*(-x))
    （40÷X+8.5）÷（50÷X+6.8）=0.507÷0.493
    x^2+5x+2250=0
    x*x+5x+2250=0
    ln（2^x+sinx）
    4.52x×x-9.04x+0.12=0
    （38.584+x）×2.05＝38.584+67.968-x
    （x∧2）/(0.1-x)＝0.0001
    x∧2＝0.0001
    x∧2＝0.0001
    （x∧2）/(0.1-x)∧2＝0.00001
    1÷x=0.32
    3.5567*120+2*3.5+6*4+3*3.3+4*3.5+4*x=3.6*(135+x)
    3.5567*120+2*3.5+6*4+3*3.3+4*3.5+19*x=154*3.6
    3.5567*120+2*3.5+6*4+3*3.3+4*3.5+19*x=154*3.6
    3.5567*120+2*3.5+6*4+3*3.3+4*3.5+12*x=147*3.6
    3.5567*120+2*3.5+6*4+3*3.3+4*4+12*x=147*3.6

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