0.1475/x＝0.1289/0.86289
    0.4/100.58＝37.09/x
    0.4÷100.58＝37.09÷x
    （42.309+x）×1.65＝72.528-x+42.309
    x²+2x+5
    8x＋4(1.5x)＝222
    A*A+A=240
    250000+x^2=（2500-x）^2
    25000+x^2=（2500-x）^2
    2500+x^2=（2500-x）^2
    500+x=2500-x
    1/7.5+1/5X=1
    1/7.5+1/5X=1
    1/7.5+1/5X=1
    1/7.5+1/5X=1
    500+x=2500-x
    2500-x=500+x
    500^2+x^2=（2500-x）^2
    500^2+x^2=2500^2-x^2
     2.4%-2.5%+2.4%x(-2.5%)

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