5*x－x^2＝14
    5*x－x^2＝14
    5*x－x∧2＝14
    5*x－x*x＝14
    65*sin22.5*t－5*t∧2＝70
    tanx=5/3
    （-（9*y/2）+y）*y=102.2
    (506*y/5+y)/y=102.2
    （109600-1.5X）*13.2/23.2*0.9=20228+11X
    （109600-2.5X）*13.2/23.2*0.9=20228+11X
    x^3+1.331+2.2x=0
    x^2-21/2x+5=0
    （x-58049.36-21742.42）/x=0.186
    (x-58049.36)/x=0.186
    (x-29437.64)/x=0.1935
     x-x*0.065-(x+1145872.48）*0.0003 = 1145872.48
    50sqrt(25/4-x^2)-32x+145=0
    x-x*0.065-(x+2311852.51）*0.0003=2311852.51
    x-x*0.065-(x+1145872.48）*0.0003=1145872.48
    -(6/7.55)^x=ln(0.9)

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