450/x-450/（x+5）=1
    x/450-（x+5）/450=1
    (t*4.4721359549995802e-05+0)^2+(t*0+0)^2-0.0050000000000000001^2=0
    9x^2-84x-588=0
    9x^2-42x-588=0
    3x^2-42x-588=0
    -x^2+x+1
    2÷x-2(1-e(-x))÷x∧2＝0.2321
    a×0.6=9.9
    a×0.6=10.9
    a×0.6=33.9
    a×0.6=25.9
    a×0.6=19.9
    (t*0.49999999999950001-0.5000000000003284)^2+(t*0-0.49999999999567146)^2-(t*0+1-2)^2*0.49999999999999967^2=0
    20÷2x=5
    -3000-1000v^0.5-200v-200v^1.5-200v^2+200v^3+400v^3.5+600v^4+800v^4.5+800v^5+800v^5.5+800v^6+3000v^6.5=0
    x^2+(x/5-19/5)^2-4x-4*(x/5-19/5)+7=0
    x^2+(x/5-19/5)^2-4x-4(x/5-19/5)+7=0
    360.295=-1045.5x²+428.63x+720.59.
    x-80000＝0.6x

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