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    7x^2 + 40x − 12 = 0;
    5700=1.36x+89
    95=1.36x+89
    17一2x=7
    30-2x×20-2x=264
    Y-Y/1.03×3%×1.1=1000000
    Y-Y/1.03×3%×1.1=1000000
    (119x^2)+676x+426 = 0
    8*24*4+5*13*4+1500
    8*24+5*13+1500
    ((1.12^10.5)-1)/(0.12*(1.12^10.5))
    ((1.12^9.5)-1)/(0.12*(1.12^9.5))
    (1.12^9.5)-1/0.12*(1.12^9.5)
    1.12^9.5
    1.12^9.5-1/0.12*1.12^9.5
    (1+0.12)^9.5-1/0.12*(1+0.12)^9.5
    tg9.7
    arc tg1.71
    √(3)÷5=tanB
    x-10/x=0.1

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