- 0.5(x-2)^2+2 = -1
    0.5(x-2)^2+2=-1
    9990x-30000=12000
    t^2+16^2=(16-2t)^2+64+4t^2+(8-t)^2
    X+(X*10%)=100
    （36-x）（24-x）=805
    190/[190+250×(1-x)]
    0.1277/x＝0.1289/0.86289
    0.1289/0.86289＝0.1277/x
    0.4/100.58＝x/32.1
    （25.851+x）×2.05＝51.702+70.453-x
    0.128/x＝0.1289/0.86289
    0.4/100.58＝X/32.2
    8.4*8.4*x-x*(0.6+2*0.355)*(0.6+2*0.355)=1490
    8.4*8.4*x-x*(0.6+2*0.355)*(0.6+2*0.355)=2131.206
    1/x-1/x^3
    x^2-16.5x+ 67.3=0
    448+16x=4x²+32x+64
    x^2+1.8x=1.75×10^(-5)
    x^2+1.8x=1.75×10^5

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