x^3+12x+9=0
    73.8×7+76.6×X=74×（7+X）
    20lgx
    4x2-35x-69=0
    14x+20=15x—11
    1/d+1/（d+2）=1/（d+3）
    xx+36 = （8-x）（8-x）+20
    x-1＝0
    xx+36=（8-x）（8-x）-16
    8*8-25-10x-x*x=25-x*x
    0.081=6843X4-192X3+37.07X2+0.8234X
    4x²-18x+9
    4x2-18x+9
    X-X/1.01*0.01*1.1-(X/1.01-(523.5+X/1.01*0.01*0.1))*0.5+5X/10000=680
    X/1.01*0.01*1.1=780
    X-X/1.01*0.01*1.1-((X/1.01-523.5-X/1.01*0.01*0.1)/(523.5+X/1.01*0.01*0.1))*30%-(X/1.01-523.5-X/1.01*0.01*0.1)*20%-X*0.0005=680
    X-X/1.01*0.01*1.1-((X/1.01-523.5-X/1.01*0.01*0.1)/(523.5+X/1.01*0.01*0.1))*30%+(X/1.01-523.5-X/1.01*0.01*0.1)*20%-X*0.0005=680
    0.| 3x-x=0.7
    x-（x/1.01*0.01*1.1）-（（x/1.01*0.99）-524-（x/1.01*0.01*0.1））/（524+x/1.01*0.01*0.1）*30%-（（x/1.01*0.99）-524-x/1.01*0.01*0.1）*0.2-5x/10000=680
    x-6=280

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