(10-w^2/4)^2+0.64(w^2)×(w^2/16+1)=100
    ｛450-20000/（x+10.4）｝*x=40000
    ｛450-20000/（x+19.8）｝*（x+9.9）=40000
    ｛450-20000/（x+21.4）｝*（x+10.7）=40000
    ｛450-20000/（x+20.8）｝*（x+10.4）=40000
    ｛450-20000/（x+20）｝*（x+10）=40000
    arctanw+arctan5w=90
    arctanw+arctan5w=90
    arctanw+arctan5w=90
    arctanw+arctan5w=90
    ｛450-20000/（x+20）｝*（x+10）=60000
    x*0.73*2.77*1.01=1.73
    x*2.66*1.01*1.03=2.71
    9.48X 100% =
    ｛450-20000/（x+20）｝*（x+10）=50000
    ｛450-20000/（x+19.8）｝*（x+9.9）=40000
    2r∧2+2r+1＝0
    4x＾2+9x-4=0
    -（x-1）²+1
    x＾2+1.86×0.00001=1.36×0.0000001

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